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CED Patents Table

 

The lengthy table further down this page lists all the US patents that relate to the RCA VideoDisc system, approximately 700 in all. These patents provide a wealth of information on the CED system, not just in regards to the final manufactured product, but also different directions the system took during the prolonged design period, and directions the system may have taken if RCA hadn't abandoned it. The CED Patents Table lists the patents according to number, which also corresponds to issue data, but not to the date the patents were actually filed, as complex patents take longer to examine than simple ones. Each patent is linked to its complete text and images, contained in patent databases on the Internet. The accompanying Featured Patents section will periodically be updated to cover the patents I find most interesting.

RCA was always heavily into patents, as the corporation had derived a great deal of licensing revenue from these over the years, first with radio and broadcasting patents and later with television patents. RCA had a Patents Operation Division directly under a Vice President to ensure that everything which could be patented was patented. Thus, there are CED patents covering a wide range of system parameters, both in the manufactured product and in the processes used to manufacture it. At first glance some of the patents in the table may appear to have nothing to do with CED, as some of the early manufacturing processes were abandoned and other processes deal with the manufacture and testing of discs and player parts and were well-known only to RCA employees. These processes include:

 

 

While researching the CED patents to include in this table, I came across a number of patents relating to other VideoDisc technologies that emerged about the same time as CED, like the Teldec system mentioned above. These patents are not included in the CED Patents Table except in rare instances where I thought their inclusion was important such as an early Sanyo patent dealing with caddy-housed Piezoelectric VideoDiscs that may have influenced RCA's later decision to use caddies; or the Toshiba patent on a recordable VideoDisc system they demonstrated at the 1983 CES, which some in the technology press dubbed "The Recordable CED" when the technology was semiconductor-based rather than capacitive.

Since I sometimes get email asking where to find information on the various VideoDisc technologies that emerged around the time of CED, I'm including a separate table for finding patents related to these other VideoDisc formats. Searching the patent databases for the term "VideoDisc" is often ineffective for early patents as the term was not widely used at the time. RCA called them "High Density Information Records," and other terms I've seen include "Audiovisual Records" and "Picture/Sound Records." A more effective search technique is to use the Assignee field (typically the company receiving the patent, like RCA) to search through all the patents issued to the company backing the VideoDisc system of interest over the span of years the system was being developed and patented (early 1970's to mid 1980's for most of these). Then any patent that from the title appears to be VideoDisc related can be investigated further. Another search method that is faster, but may miss some relevant patents is to do an AND search where the Assignee field is ANDED with the Title or Abstract field on terms like "Disc," "Disk," and "Record." The table below lists the various VideoDisc technologies contemporary to CED, the common names for the technologies, and the major assignees:

 

VideoDisc Systems Contemporary to CED
Disc Technology Common Name(s) Main Patent Assignee(s)
Piezoelectric flexible Teldec, TED Teldec, Sanyo
Piezoelectric rigid VISC, VISC II Matsushita
Grooveless Capacitance VHD Victor, Matsushita
Reflective Optical LaserDisc, DiscoVision, LaserVision Philips, Magnavox, DiscoVision Associates, MCA, Pioneer
Transmissive Optical Thomson-CSF Thomson
Photographic Film ARDEV, Laserfilm I/O Metrics, Atlantic Richfield, McDonnell Douglas
Holographic ? Hitachi
Semiconductor ? Toshiba ( aka Tokyo Shibaura)
Pictorial Optidisc N/A (French inventor named Guy Nathan)
Magnetic MDR N/A (German inventor named Erich Rabe)

 

The Table of CED Patents contains links to two major patent databases: the Delphion Intellectual Property Network and the US Patent & Trademark Office. Both of these are somewhat different as detailed below:

 

 

Clicking on the patent numbers in the first column will load the patent page from the Delphion site in a separate window. Clicking on PTO in the USPTO column will load the patent page from the USPTO site in a separate browser window. The table lists Utility patents first (with the US prefix), while Design, Reissue, and Def. Pub. patents are at the bottom of the table (with the prefixes D, RE, and T). Assignees other than RCA are indicated in parentheses after the title of the patent.

 

Table of CED Patents
Patent No. Date Issued Title of Patent USPTO
US03711641 01/16/73 Velocity adjusting system PTO*
US03783196 01/01/74 High-density capacitive information records and playback apparatus therefor PTO*
US03803351 04/09/74 Disc eject and brake mechanism for a video disc player (Zenith) PTO*
US03806668 04/23/74 Information playback system PTO*
US03826877 07/30/74 Information playback system stylus PTO*
US03829612 08/13/74 Video disc playback eddy current speed control system PTO*
US03833408 09/03/74 Video discs having a methyl alkyl silicone coating PTO*
US03835262 09/10/74 Video disc cutting using pressurized air to control depth of grooves (Zenith) PTO*
US03837656 09/24/74 Chip removal in the mastering of fine-grooved discs PTO*
US03842194 10/15/74 Information records and recording/playback systems therefor PTO*
US03842217 10/15/74 Record fabrication of a capacitive type storage medium PTO*
US03843846 10/22/74 Demountable capacitive protective coupling for pickup transducers PTO*
US03852771 12/03/74 Electron beam recording process PTO*
US03864733 02/04/75 Control signal apparatus for video disc player PTO*
US03865997 02/11/75 Triangular piezoelectric transducer for recording video information PTO*
US03870320 03/11/75 Pickup arm control for video disc player PTO*
US03870835 03/11/75 Stylus control apparatus for a video disc record player PTO*
US03871020 03/11/75 Chrominance signal correction PTO*
US03871663 03/18/75 Record contact spindle PTO*
US03872240 03/18/75 Pickup apparatus for capacitive video disc players with transmission line tuned circuit PTO*
US03872241 03/18/75 Video disc pickup with capacitive tracking (Zenith) PTO*
US03872265 03/18/75 Video disc transmission line and stylus rf return systems PTO*
US03872497 03/18/75 Signal translating apparatus for composite signal subject to jitter PTO*
US03872498 03/18/75 Color information translating systems PTO*
US03873098 03/25/75 Rotary stylus reshaper PTO*
US03873762 03/25/75 Spring loaded stylus arm pivot PTO*
US03873764 03/25/75 Speed correction system for a video disk playback system PTO*
US03873765 03/25/75 Disc playback system with speed control of a belt drive PTO*
US03873782 03/25/75 Capacitive protection coupling element for stylus electrode discharge PTO*
US03873783 03/25/75 Universal stylus arm pivot coupling PTO*
US03873990 03/25/75 Chrominance signal correction PTO*
US03880725 04/29/75 Predetermined thickness profiles through electroplating PTO*
US03881734 05/06/75 Rotary stylus cleaner PTO*
US03882214 05/06/75 Trapezoidal smooth grooves for video disc PTO*
US03882267 05/06/75 Video playback system tracking arm and pickup assembly PTO*
US03888493 06/10/75 Apparatus for inhibiting a plurality of records from being disposed on a turntable PTO*
US03891796 06/24/75 Positioning and mounting means for a flexible video disk (Sanyo) PTO*
US03893127 07/01/75 Electron beam recording media PTO*
US03897955 08/05/75 Adjustable stylus assembly (Zenith) PTO*
US03901994 08/26/75 Metallized video disc having a dielectric coating thereon PTO*
US03904488 09/09/75 True replication of soft substrates PTO*
US03909517 09/30/75 Disc records with groove bottom depth variations PTO*
US03909518 09/30/75 Signal switching apparatus for compensating record defects PTO*
US03911476 10/07/75 Color picture/sound record PTO*
US03912283 10/14/75 Turntable speed lock system PTO*
US03912857 10/14/75 Stylus arm pivot PTO*
US03914542 10/21/75 Timing signals for velocity error correction PTO*
US03917903 11/04/75 Detachable pickup arm magnetic coupling PTO*
US03920861 11/18/75 Method of making a semiconductor device PTO*
US03924323 12/09/75 Method of making a multiplicity of multiple-device semiconductor chips and article so produced PTO*
US03930117 12/30/75 Video capacitive disc playback apparatus and stylus with dielectric coating therefor PTO*
US03930653 01/06/76 Lid latch mechanism for a disc record player PTO
US03934263 01/20/76 Video disc recording apparatus and methods PTO
US03935331 01/27/76 Preparation of olefin SO2 copolymer electron beam resist films and use of same for recording PTO
US03935332 01/27/76 Development of poly(1-methyl-1-cyclopentene-SO.sub.2) electron beam resist PTO
US03938179 02/10/76 Comb filter for video processing PTO
US03938810 02/17/76 Center hole formation in an information storing disc PTO
US03940148 02/24/76 Lid interlock apparatus for a disc record player PTO
US03940507 02/24/76 Electron beam recording media and method of recording PTO
US03940556 02/24/76 Timing error detecting and speed control system PTO
US03943275 03/09/76 Precision turntable rotation in a vacuum atmosphere PTO
US03943276 03/09/76 Record tracking pickup structure for a capacitive disc (Zenith) PTO
US03943302 03/09/76 Electron beam recording in thick materials PTO
US03945902 03/23/76 Metallized device and method of fabrication PTO
US03950173 04/13/76 Electron beam recording article with o-quinone diazide compound PTO
US03952145 04/20/76 Pickup arm cartridge apparatus PTO
US03952147 04/20/76 Pickup arm cartridge PTO
US03954272 05/04/76 Signal pickup return mechanism PTO
US03956581 05/11/76 Pickup arm apparatus PTO
US03961100 06/01/76 Method for developing electron beam sensitive resist films PTO
US03961101 06/01/76 Process for improved development of electron-beam-sensitive resist films PTO
US03961131 06/01/76 Disc record locked groove escape apparatus PTO
US03963860 06/15/76 Locked groove detection and correction in video disc playback apparatus PTO
US03963861 06/15/76 Disc record groove skipper apparatus PTO
US03963864 06/15/76 Pickup arm assembly PTO
US03965482 06/22/76 Velocity correction circuit for video discs PTO
US03967254 06/29/76 Charge transfer memory PTO
US03967311 06/29/76 Velocity correction for video discs PTO
US03968326 07/06/76 Trapezoidal smooth grooves for video disc PTO
US03969756 07/13/76 Color-picture/multichannel-sound record and recording/playback apparatus and methods therefor PTO
US03969757 07/13/76 Color image signal processing circuits PTO
US03969759 07/13/76 Defect compensation systems PTO
US03970317 07/20/76 Apparatus for inhibiting a plurality of disc records from being disposed on a turntable and grounding a disc record disposed on the turntable PTO
US03972064 07/27/76 Apparatus and methods for playback of color picture/sound records PTO
US03972533 08/03/76 Signal pickup lifting/lowering apparatus PTO
US03982066 09/21/76 Metal coating for video discs PTO
US03983316 09/28/76 Turntable speed control system PTO
US03983318 09/28/76 Velocity correction system with damping means PTO
US03984907 10/12/76 Adherence of metal films to polymeric materials PTO
US03989436 11/02/76 Apparatus for producing injection molded and centrally apertured disc records PTO
US03993316 11/23/76 Overhead signal pickup device PTO
US03993863 11/23/76 Disc record groove skipper PTO
US03996606 12/07/76 Comb filter for video processing PTO
US03996610 12/07/76 Comb filter apparatus for video playback systems PTO
US03997716 12/14/76 Disc record locked groove escape apparatus PTO
US03997807 12/14/76 Mechanically adjustable electron gun apparatus PTO
US04001496 01/04/77 Defect detection and compensation apparatus for use in an FM signal translating system PTO
US04004080 01/18/77 Metal coating for video discs PTO
US04005437 01/25/77 Method of recording information in which the electron beam sensitive material contains 4,4'-bis(3-diazo-3-4-oxo-1-naphthalene sulfonyloxy)benzil PTO
US04005474 01/25/77 Recording apparatus and methods for a color picture/sound record PTO
US04007295 02/08/77 Olefin-SO2 copolymer film adhesion to a substrate PTO
US04010318 03/01/77 Probe forming electron optical column having means for examining magnified image of the probe source PTO
US04010485 03/01/77 Charge-coupled device input circuits PTO
US04012536 03/15/77 Electron beam recording medium comprising 1-methylvinyl methyl ketone PTO
US04013830 03/22/77 Video disc stylus PTO
US04017677 04/12/77 Squelch circuit for a video record player PTO
US04017678 04/12/77 End-of-play control system PTO
US04018937 04/19/77 Electron beam recording comprising polymer of 1-methylvinyl methyl ketone PTO
US04018945 04/19/77 Method of making a metallized video disc having an insulating layer thereon PTO
US04018984 04/19/77 Video disc record having spirally aligned sync storage locations PTO
US04018987 04/19/77 Video disc playback apparatus PTO
US04022968 05/10/77 Recording apparatus and methods for use in forming a video disc record having spirally aligned sync storage locations PTO
US04024122 05/17/77 Method of purifying 2,4-bis(6-diazo-5,6-dihydro-5-oxo-1-naphthalenesulfonyloxy benzophenone) PTO
US04030123 06/14/77 Stylus adjustment apparatus for a video disc player PTO
US04030124 06/14/77 Video disc playback system and pickup cartridge therefor PTO
US04030138 06/14/77 Record protection system PTO
US04030815 06/21/77 Hydrostatic bearing apparatus PTO
US04030835 06/21/77 Defect detection system PTO
US04031546 06/21/77 Disc player and stylus therefor PTO
US04035590 07/12/77 Apparatus for electromechanical recording of short wavelength modulation in a metal master PTO
US04038682 07/26/77 Video disc player apparatus for establishing electrical connection between a stylus electrode and a signal processing circuit PTO
US04038686 07/26/77 Defect detection and compensation PTO
US04040089 08/02/77 Disc master positioning apparatus for a recording system PTO
US04040634 08/09/77 Overhead disc record grounding apparatus PTO
US04040635 08/09/77 Releasable stylus arm magnetic coupling PTO
US04044379 08/23/77 Method and apparatus for electromechanical recording of short wavelength modulation in a metal master PTO
US04046384 09/06/77 Stylus cleaning system for disc record player PTO
US04049280 09/20/77 Pickup cartridge PTO
US04053161 10/11/77 Stylus arm lifting/lowering apparatus for a video disc player PTO
US04057826 11/08/77 Sync responsive systems for video disc players PTO
US04059277 11/22/77 Stylus arm lifting/lowering apparatus for a video disc player system PTO
US04060471 11/29/77 Composite sputtering method PTO
US04060831 11/29/77 Wideband electromechanical recording system PTO
US04065306 12/27/77 Electron beam recording media containing 4,4'-bis(3-diazo-3,4-dihydro-4-oxo-1-naphthalene-sulfonyloxy)benzil PTO
US04065786 12/27/77 Videodisc playback system PTO
US04069484 01/17/78 Defect plotting system PTO
US04072985 02/07/78 Video disc with a dielectric layer formed from styrene and nitrogen PTO
US04074313 02/14/78 Electron beam disc recorder PTO
US04077050 02/28/78 Video disc player employing a spring loaded stylus apparatus PTO
US04077051 02/28/78 Video disc with a conductive layer having an oxygen content gradient PTO
US04077052 02/28/78 Video disc capacitive recording means with a conductive bilayer PTO
US04080625 03/21/78 Pickup circuitry for a video disc player with printed circuit board PTO
US04084188 04/11/78 Optical scanner PTO
US04084690 04/18/78 Video disc package having a center post PTO
US04084691 04/18/78 Video disc package PTO
US04085178 04/18/78 Method for producing injection molded and centrally apertured disc records PTO
US04086617 04/25/78 Video disc player mechanism control system PTO
US04093152 06/06/78 Disc caddy and disc player system therefor PTO
US04093959 06/06/78 Chrominance signal transcoding apparatus PTO
US04096513 06/20/78 Color video signal processing circuits PTO
US04098030 07/04/78 Method for forming a narrowed-electrode pickup stylus for video disc systems PTO
US04098511 07/04/78 Video disc handling system for a video disc player PTO
US04099724 07/11/78 Automatic disc wiping apparatus PTO
US04100465 07/11/78 Turntable speed control system PTO
US04104832 08/08/78 Method for forming keel-tipped stylus for video disc systems PTO
US04109919 08/29/78 Package actuated record extracting mechanism for a video disc player PTO
US04110784 08/29/78 Noise reduction apparatus PTO
US04113262 09/12/78 Record support and alignment apparatus for a video disc player PTO
US04113897 09/12/78 Smooth groove formation method employing spin coating of negative replica of inscribed disc PTO
US04123779 10/31/78 Turntable rotational speed and phase control system for a video disc play/record apparatus PTO
US04124118 11/07/78 Rotational restraint for a video disc package PTO
US04124866 11/07/78 Video disc insertion/extraction system for a video disc player PTO
US04124867 11/07/78 Narrowed-electrode pickup stylus for video disc systems PTO
US04127799 11/28/78 Apparatus for damping rotation of turntable (Hitachi) PTO
US04127872 11/28/78 Novel amino siloxane lubricants PTO
US04128247 12/05/78 Stylus position control system PTO
US04129536 12/12/78 Vinyl chloride based injection molding composition PTO
US04133540 01/09/79 Record handling system for a video disc player PTO
US04134028 01/09/79 Charge transfer circuits with compensation for transfer losses PTO
US04136358 01/23/79 Transcoding apparatus PTO
US04136940 01/30/79 Resist development control system PTO
US04137550 01/30/79 Video disc with a dielectric layer formed from acetylene and nitrogen PTO
US04138703 02/06/79 Video disc package PTO
US04139784 02/13/79 CCD Input circuits PTO
US04142209 02/27/79 Disc track servo system PTO
US04145711 03/20/79 SECAM modulator PTO
US04145718 03/20/79 Video disc pickup with preplay stylus PTO
US04145726 03/20/79 Video record package PTO
US04148067 04/03/79 Modulated groove records with a thick metal layer and method for making same (EMI) PTO
US04149729 04/17/79 Disc caddy and disc player system therefor PTO
US04150395 04/17/79 Time base error correction system PTO
US04151132 04/24/79 Molding composition PTO
US04152641 05/01/79 Method and apparatus for the determination of signal pickup qualities of a stylus of a capacitive disc video player PTO
US04155098 05/15/79 Groove depth estimation system using diffractive groove effects PTO
US04159827 07/03/79 Video disc package PTO
US04162510 07/24/79 Keel-tipped stylus for video disc systems PTO
US04162511 07/24/79 Velocity correction system for video disc player PTO
US04164755 08/14/79 Video disc pickup apparatus PTO
US04164756 08/14/79 Disc record groove skipper PTO
US04164782 08/14/79 Locking mechanism for record package PTO
US04165560 08/28/79 Method for manufacturing a diamond stylus for video disc players PTO
US04167749 09/11/79 Noise reduction apparatus PTO
US04168330 09/18/79 Method of depositing a silicon oxide layer PTO
US04173348 11/06/79 Grooved record playback system PTO
US04175751 11/27/79 Toggle mechanism for video disc player PTO
US04176378 11/27/79 Signal pickup arm lifting/lowering and groove skipper apparatus PTO
US04178614 12/11/79 Readout of a densely packed CCD PTO
US04179708 12/18/79 Optical playback system having increased depth-of-field PTO
US04180830 12/25/79 Depth estimation system using diffractive effects of the grooves and signal elements in the grooves PTO
US04183059 01/08/80 Track skipper for a video disc player PTO
US04184174 01/15/80 Comb filter system PTO
US04189746 02/19/80 Method and apparatus for determining focus conditions PTO
US04191380 03/04/80 Video disc player having unitary record handling platform construction PTO
US04191381 03/04/80 Apparatus for facilitating carriage return in video disc player PTO
US04191895 03/04/80 Low noise CCD input circuit PTO
US04191896 03/04/80 Low noise CCD input circuit PTO
US04195309 03/25/80 Video processing system including comb filters PTO
US04196906 04/08/80 Video disc player PTO
US04197011 04/08/80 Defect detection and plotting system PTO
US04198060 04/15/80 Wiping apparatus and method for a high-density information record PTO
US04198658 04/15/80 Recording/playback apparatus facilitating track skip detection PTO
US04200881 04/29/80 Encoding and transcoding apparatus for video disc systems PTO
US04202594 05/13/80 RF Connector assembly including mounting apparatus for a washer-like capacitor PTO
US04203134 05/13/80 FM Signal demodulator with defect detection PTO
US04204220 05/20/80 Dual standard video disc player PTO
US04205853 06/03/80 Record side identification apparatus for video disc player PTO
US04206256 06/03/80 Metallized video disc having an insulating layer thereon PTO
US04206477 06/03/80 Optical recording with track drop compensation PTO
US04206926 06/10/80 Video disc player having record size identification apparatus PTO
US04211421 07/08/80 Video disc player having adjustable end-of-play switch PTO
US04213148 07/15/80 Recording/playback apparatus using a single pilot tone for active tracking and control of a video disc pickup device PTO
US04216969 08/12/80 Carriage translating apparatus for video disc player PTO
US04216970 08/12/80 Video disc lubricants PTO
US04220338 09/02/80 Video disc player having modular construction PTO
US04220339 09/02/80 Caddy-actuated declutching mechanism for video disc player PTO
US04220340 09/02/80 Constant drag carriage translating mechanism for video disc player PTO
US04220915 09/02/80 Resistivity measurement system PTO
US04221930 09/09/80 FM Defect compensation apparatus PTO
US04225141 09/30/80 Mechanism for aiding carriage return in video disc player PTO
US04227699 10/14/80 Manual scanning mechanism for video disc player PTO
US04228050 10/14/80 Conductive molding composition PTO
US04229714 10/21/80 RF Connector assembly with provision for low frequency isolation and RFI reduction PTO
US04236823 12/02/80 Diffractometer for measuring signal depth and width PTO
US04239108 12/16/80 Video disc caddy PTO
US04239237 12/16/80 Turntable drive system for video disc player PTO
US04239238 12/16/80 Record extracting mechanism for caddy type video disc player PTO
US04241120 12/23/80 Video discs and molding compositions therefor PTO
US04242655 12/30/80 RF Connector assembly with low frequency isolation PTO
US04243395 01/06/81 Method for precision grinding of hard, pointed materials PTO
US04247119 01/27/81 Record side identification apparatus for video disc player PTO
US04247866 01/27/81 Nested loop video disc servo system PTO
US04252848 02/24/81 Perfluorinated polymer thin films PTO
US04256311 03/17/81 Video disc stylus retractor PTO
US04257009 03/17/81 Inhibit circuit for a differential amplifier PTO
US04258233 03/24/81 Track skipper apparatus for video disc player PTO
US04259166 03/31/81 Shield for plating substrate PTO
US04260647 04/07/81 Method of depositing an abrasive layer PTO
US04262174 04/14/81 Track skipper for video disc player PTO
US04262875 04/21/81 Information record stampers PTO
US04263612 04/21/81 Comb filter equalization circuit PTO
US04266784 05/12/81 Video disc caddy having disc entrapment PTO
US04266785 05/12/81 Stylus lifting/lowering actuator with improved electromagnetic motor PTO
US04272083 06/09/81 Video disc player having record extracting mechanism PTO
US04272786 06/09/81 Video disc playback apparatus with non-linear aperture correction PTO
US04275100 06/23/81 Video disc processing PTO
US04275101 06/23/81 Video disc lubricants PTO
US04275416 06/23/81 PCM Detector PTO
US04277695 07/07/81 Amplifier having dead zone of controllable width and position PTO
US04277796 07/07/81 Slow down color processor for video disc mastering using a special mode VTR PTO
US04278846 07/14/81 Video disc locked groove clearance system PTO
US04278992 07/14/81 PCM Detector for video reproducer apparatus PTO
US04280023 07/21/81 Stylus position sensing apparatus for video disc player PTO
US04280024 07/21/81 Selectively damped video disc stylus assembly PTO
US04280941 07/28/81 Video discs and molding compositions therefor PTO
US04281407 07/28/81 Surface acoustic wave pickup and recording device PTO
US04281816 08/04/81 Automatic apparatus for molding a preform PTO
US04282268 08/04/81 Method of depositing a silicon oxide dielectric layer PTO
US04282311 08/04/81 Method for fabricating flyleads for video disc styli PTO
US04284712 08/18/81 Fabrication of video disc flyleads PTO
US04285524 08/25/81 Stylus cleaning apparatus for video disc player PTO
US04286235 08/25/81 VFO having plural feedback loops PTO
US04286282 08/25/81 Periodically biased video disc player servo system PTO
US04286283 08/25/81 Transcoder PTO
US04286290 08/25/81 Fast recovery squelch circuit for a video disc player PTO
US04287587 09/01/81 Signal loss detector for video disc PTO
US04287689 09/08/81 Method for improving the quality of low frequency output of a video disc pickup stylus PTO
US04292511 09/29/81 Apparatus and method for reading an identifying label on an information record PTO
US04295216 10/13/81 Apparatus for measuring the characteristics of a wideband electromechanical recording system having a transformer PTO
US04296144 10/20/81 Ion implanted stylus PTO
US04296371 10/20/81 System for measuring stylus shoe length PTO
US04296446 10/20/81 Motor speed control circuit PTO
US04297312 10/27/81 Method for preparing stylus lapping discs PTO
US04299736 11/10/81 Conductive molding composition and discs therefrom PTO
US04302175 11/24/81 Apparatus for molding recorded discs PTO
US04303939 12/01/81 Horizontal stability measurement apparatus PTO
US04305145 12/08/81 Spindle retracting mechanism for disc record player PTO
US04305146 12/08/81 Disc player having disc stabilizing apparatus PTO
US04305791 12/15/81 Method for the manufacture of capacitive electronic discs PTO
US04305795 12/15/81 Method for the manufacture of stampers PTO
US04306013 12/15/81 Asymmetrical radiation exposure of spin coated photoresist to obtain uniform thickness coating used to replicate spiral grooves in plastic substrate PTO
US04306256 12/15/81 Preemphasis and clipping apparatus for reducing distortions PTO
US04307418 12/22/81 Video disc player system for correlating stylus position with information previously detected from disc PTO
US04307419 12/22/81 Video disc signal surface imaging apparatus PTO
US04308337 12/29/81 Uniform light exposure of positive photoresist for replicating spiral groove in plastic substrate PTO
US04308557 12/29/81 Video disc system PTO
US04309265 01/05/82 Cathode mask knob PTO
US04309456 01/05/82 Method and apparatus for coating recorded discs with a lubricant PTO
US04309721 01/05/82 Error coding for video disc system PTO
US04309722 01/05/82 Video disc player noise reduction circuit PTO
US04310913 01/12/82 Stylus tracking aid using two bimorph elements longitudinally aligned PTO
US04310914 01/12/82 Skipper-assisted active search PTO
US04310915 01/12/82 Dual parallelogram cutterhead suspension apparatus PTO
US04312013 01/19/82 Non-linear aperture correction circuit PTO
US04313062 01/26/82 Bidirectional deflector driver for video disc PTO
US04313134 01/26/82 Track error correction system as for video disc player PTO
US04313189 01/26/82 Stylus position sensor for video disc player apparatus PTO
US04315277 02/09/82 Non-linear aperture correction circuit having a signal bypass arrangement PTO
US04315358 02/16/82 Method for the manufacture of capacitive pickup styli PTO
US04316143 02/16/82 Speed deviation detector for servo controlled disc mastering turntable PTO
US04316213 02/16/82 Video processor employing variable amplitude compression of the chrominance component PTO
US04316279 02/16/82 Optical recording in thin photoresist PTO
US04316281 02/16/82 Spacer for stacked recorded discs PTO
US04316539 02/23/82 Video disc caddy PTO
US04316778 02/23/82 Method for the manufacture of recording substrates for capacitance electronic discs PTO
US04317192 02/23/82 Head suspension velocity control apparatus for electromechanical recorder PTO
US04318120 03/02/82 Color TV buried subcarrier system PTO
US04318877 03/09/82 Video disc molding process PTO
US04320487 03/16/82 Video disc stylus control apparatus PTO
US04320490 03/16/82 Video disc cartridge having a self retaining electrode PTO
US04320491 03/16/82 Apparatus for video disc stylus electrode reconditioning PTO
US04320567 03/23/82 Optical inspection method for determining machinability PTO
US04321702 03/23/82 Carriage reset apparatus for disc record player PTO
US04321772 03/30/82 Levelable lapping machine PTO
US04323998 04/06/82 Video disc locked groove corrector PTO
US04325134 04/13/82 Video disc defect detector PTO
US04325136 04/13/82 Video disc player having carriage drive apparatus PTO
US04326284 04/20/82 Video disc player having turntable assist apparatus PTO
US04326325 04/27/82 Method and apparatus for deflashing molded recorded discs PTO
US04327047 04/27/82 Method for producing disc records having molded-in center holes PTO
US04327048 04/27/82 High density information disc processing PTO
US04327140 04/27/82 High density information disc lubricants PTO
US04327431 04/27/82 Video disc player with variable offset RFI reduction circuit PTO
US04327432 04/27/82 Video disc player with RFI reduction circuit PTO
US04327434 04/27/82 Video disc stylus position sensor system PTO
US04327830 05/04/82 Record stamper protector PTO
US04328575 05/04/82 Disc player having turntable height varying apparatus PTO
US04328646 05/11/82 Method for preparing an abrasive coating PTO
US04329575 05/11/82 Video disc having a label for identifying material recorded thereon PTO
US04329712 05/11/82 Adaptive distortion elimination circuitry for a video disc player PTO
US04330583 05/18/82 High density information record lubricants PTO
US04330879 05/18/82 Adaptive stylus kicker using disc track and disc sector information PTO
US04330881 05/18/82 Video disc apparatus for clearing foreign matter from the signal pickup stylus during playback PTO
US04330882 05/18/82 Apparatus for monitoring a wideband electromechanical recording system PTO
US04330915 05/25/82 Technique for uniform stylus configuration PTO
US04332841 06/01/82 Mold preparation method PTO
US04333174 06/01/82 Transducer displacement apparatus for video disc player PTO
US04333592 06/08/82 Apparatus for handling deformable components supported in a matrix PTO
US04334849 06/15/82 Apparatus for molding a recorded disc PTO
US04336555 06/22/82 Video accessory having channel identifier PTO
US04337536 06/29/82 Flylead for a video disc stylus cartridge PTO
US04339281 07/13/82 Shank diamond cleaning PTO
US04339471 07/13/82 Method of coating substrates with an abrasive layer PTO
US04339682 07/13/82 Rotative motor using a piezoelectric element PTO
US04340629 07/20/82 High density information disc PTO
US04340949 07/20/82 Processor controlled video disc servo system PTO
US04340953 07/20/82 Information recording medium and recording and reproducing system using the same (Toshiba) PTO
US04340954 07/20/82 Stylus tip fabrication from a synthetic diamond stone PTO
US04340956 07/20/82 Minimum tracking force stylus PTO
US04341437 07/27/82 Stylus tip positioning technique PTO
US04341472 07/27/82 Method and apparatus for positioning a tapered body PTO
US04341613 07/27/82 Apparatus for electroforming PTO
US04341952 07/27/82 Variable pitch grooved label for video disc PTO
US04342001 07/27/82 Differential amplifier having a low-pass characteristic PTO
US04342109 07/27/82 Carriage alignment apparatus for video disc player PTO
US04342394 08/03/82 Removable protective cover for a video disc stylus cartridge PTO
US04342659 08/03/82 Video disc lubricants PTO
US04342660 08/03/82 High density information disc lubricants PTO
US04344166 08/10/82 Driver arrangement for stylus lifting/lowering apparatus PTO
US04346468 08/24/82 High density information disc PTO
US04346469 08/24/82 High density information disc PTO
US04349902 09/14/82 Piezoelectric transducer for recording video information PTO
US04351046 09/21/82 Video disc player having carriage detent mechanism PTO
US04351048 09/21/82 High density information disc lubricants PTO
US04352175 09/28/82 Video disc player having record side identifying apparatus PTO
US04352564 10/05/82 Missing order defect detection apparatus PTO
US04352836 10/05/82 Method for obtaining an abrasive coating PTO
US04355052 10/19/82 Method of preparing an abrasive coated substrate PTO
US04355062 10/19/82 Bis(hydroxyalkyl)disiloxanes and lubricant compositions thereof PTO
US04355382 10/19/82 Apparatus for sharpening a cutting stylus PTO
US04357216 11/02/82 Method for electroforming a replica on a record matrix PTO
US04357628 11/02/82 Video disc player with burst remover PTO
US04357698 11/02/82 Video disc player having caddy-actuated record receiving pads PTO
US04358841 11/09/82 Video disc player having stylus protecting apparatus PTO
US04359375 11/16/82 Anode assembly for electroforming record matrixes PTO
US04360829 11/23/82 Active distortion elimination circuitry for a video disc player PTO
US04361595 11/30/82 Method for preparing an abrasive lapping disc PTO
US04361849 11/30/82 Video disc vari-speed playback system PTO
US04361881 11/30/82 Video disc player with RFI reduction circuit including signal subtraction PTO
US04361883 11/30/82 Cartridge force and bias adjustment gage PTO
US04361884 11/30/82 Video disc player having click mechanism PTO
US04362236 12/07/82 Workpiece loader PTO
US04362492 12/07/82 Apparatus for compression molding recorded discs PTO
US04363117 12/07/82 Video disc with dynamic stylus cleaning PTO
US04363118 12/07/82 Sound carrier amplitude measurement system PTO
US04364119 12/14/82 Video disc player with RFI reduction circuit including a signal product generator PTO
US04364121 12/14/82 Pickup cartridge for video disc player PTO
US04365447 12/28/82 Apparatus and method for sharpening a cutting stylus PTO
US04366563 12/28/82 Video disc stylus suspension apparatus PTO
US04368370 01/11/83 Switch actuating apparatus for video disc player PTO
US04369604 01/25/83 Method for mechanically preparing stylus lapping discs PTO
US04370672 01/25/83 Color subcarrier regenerator for slow down processor PTO
US04370738 01/25/83 Video disc player having record retaining mechanism PTO
US04370739 01/25/83 Spinel video disc playback stylus PTO
US04371959 02/01/83 Position sensor for video disc PTO
US04371961 02/01/83 Capacitive information system PTO
US04374434 02/15/83 Video disc stylus cartridge with protective member PTO
US04375094 02/22/83 Apparatus for advancing a video disc pickup transducer beyond a disc record defect PTO
US04375095 02/22/83 Method and apparatus for testing styli PTO
US04375096 02/22/83 Multi-bandwidth optical playback apparatus with elongated read spot PTO
US04375854 03/08/83 Stone sorting apparatus and method PTO
US04375992 03/08/83 Apparatus and method for cleaning recorded discs PTO
US04376087 03/08/83 Processing of video discs PTO
US04376303 03/08/83 Quasi-zoom lens optical focus sensor PTO
US04376954 03/15/83 Slow down processor for video disc mastering having color phase error detector/corrector PTO
US04376956 03/15/83 Video disc player having timebase correction and constant angular velocity turntable PTO
US04377788 03/22/83 Signal expander PTO
US04378310 03/29/83 Conductive molding composition PTO
US04379510 04/12/83 Method and apparatus for sorting stones PTO
US04379686 04/12/83 Apparatus for molding a recorded disc PTO
US04381557 04/26/83 Optical focus sensor PTO
US04381964 05/03/83 Method and apparatus for separating a stamper from a mold PTO
US04382292 05/03/83 Video disc player having stylus position sensing apparatus PTO
US04382299 05/03/83 Disc record system employing signal redundancy PTO
US04383276 05/10/83 Video disc player with a freeze frame feature PTO
US04383961 05/17/83 Drying process for video discs PTO
US04385326 05/24/83 Video disc systems with plural preemphasis/deemphasis networks PTO
US04385374 05/24/83 Video disc player with RFI reduction circuit including an AGC amplifier and dual function peak detector PTO
US04385978 05/31/83 Cathode head PTO
US04386319 05/31/83 ESR Analysis of conductive video disc components PTO
US04386375 05/31/83 Video disc player with multiple signal recovery transducers PTO
US04386377 05/31/83 TV Interface RF modulation circuitry PTO
US04387407 06/07/83 Video disc player having auxiliary vertical synchronizing generator PTO
US04387540 06/14/83 Method of forming reference flats on styli PTO
US04388654 06/14/83 Video disc player with selectively enabled audio signal expander circuitry PTO
US04388714 06/14/83 Technique for uniform stylus configuration PTO
US04389441 06/21/83 High density information record lubricants PTO
US04390487 06/28/83 Method of making a laminated recorded disc PTO
US04390579 06/28/83 Doped polyphenylene ether lubricant for high density information discs PTO
US04390978 06/28/83 Carriage translating mechanism for video disc player PTO
US04391520 07/05/83 Technique for optical alignment of a workpiece PTO
US04391696 07/05/83 Method and apparatus for holding styli PTO
US04391720 07/05/83 Bis(hydroxylkyl)disiloxanes and lubricant compositions thereof PTO
US04391843 07/05/83 Adherent perfluorinated layers PTO
US04393160 07/12/83 Aqueous developable poly(olefin sulfone) terpolymers PTO
US04393414 07/12/83 Horizontal-rate phase-change of TV pixel distribution among multiple recorder tracks for dropout concealment PTO
US04393487 07/12/83 Stylus cartridge PTO
US04393489 07/12/83 Audio processor for single, channel, matrixed two-channel and un-matrixed two-channel signals PTO
US04394341 07/19/83 Method to center and separate electroformed replicas from a matrix PTO
US04395122 07/26/83 Defect detection system PTO
US04395737 07/26/83 Video disc slow down processor with reverse color detector/corrector PTO
US04397627 08/09/83 Apparatus for molding a recorded disc PTO
US04398281 08/09/83 Caddy loading video disc player PTO
US04399061 08/16/83 Preparation of video disc molding composition PTO
US04399329 08/16/83 Stereophonic bilingual signal processor PTO
US04399385 08/16/83 Rotative motor using a triangular piezoelectric element PTO
US04399386 08/16/83 Rotative motor using plural arrays of piezoelectric elements PTO
US04400245 08/23/83 Matrixing process for the manufacture of molded records PTO
US04400806 08/23/83 Pickup arm suspension for video disc cartridge PTO
US04400807 08/23/83 Stylus position detecting apparatus (Hitachi) PTO
US04402072 08/30/83 Video disc mastering using gimballed air puck PTO
US04402660 09/06/83 Apparatus for producing disc records with a molded-in center hole PTO
US04402798 09/06/83 Method for the manufacture of a metallic recording substrate for a capacitance electronic disc and the recording substrate obtained thereby PTO
US04403244 09/06/83 Apparatus for correcting a variation in the time base of a reproduced video signal (Hitachi) PTO
US04403369 09/13/83 Internal caddy cleaning apparatus PTO
US04403453 09/13/83 Stylus coning fixture PTO
US04404669 09/13/83 Stylus assembly PTO
US04404670 09/13/83 Pickup arm retainer for video disc cartridge PTO
US04405541 09/20/83 Video disc processing PTO
US04405670 09/20/83 Capacitance electronic disc stamper having improved stain resistance and method for the manufacture thereof PTO
US04405946 09/20/83 Television signal converting apparatus providing an on-screen tuning display PTO
US04406002 09/20/83 Servo system for a videodisc player carriage assembly PTO
US04406381 09/27/83 Stylus dispensing apparatus and method PTO
US04408315 10/04/83 Video disc player having stylus cleaning apparatus PTO
US04408320 10/04/83 Spacer for use in testing information recorded discs PTO
US04409626 10/11/83 Video disc player having vertical timing signal generator PTO
US04410748 10/18/83 High density information disc lubricants PTO
US04412319 10/25/83 Video disc player with self calibrating stylus translator PTO
US04414167 11/08/83 Method for molding an article PTO
US04414660 11/08/83 High density information disc PTO
US04415423 11/15/83 Electroforming apparatus for use in matrixing of record molding parts PTO
US04416789 11/22/83 High density information disc lubricants PTO
US04416807 11/22/83 Conductive video discs PTO
US04417332 11/22/83 Turntable speed control PTO
US04417423 11/29/83 Stylus manufacturing method PTO
US04418363 11/29/83 Video disc player with RFI reduction circuit including sync tip clamp PTO
US04418364 11/29/83 Video player apparatus having caption generator PTO
US04418405 11/29/83 Lens positioning controller for optical playback apparatus PTO
US04418407 11/29/83 Video disc pickup stylus PTO
US04418408 11/29/83 Stylus arm for video disc player PTO
US04418500 12/06/83 Grinding apparatus PTO
US04419699 12/06/83 Digital on video recording and playback system PTO
US04419848 12/13/83 Method and apparatus for rotating a stylus during lapping PTO
US04421798 12/20/83 Apparatus for coating recorded discs with a lubricant PTO
US04422052 12/20/83 Delay circuit employing active bandpass filter PTO
US04422104 12/20/83 Time base error correcting apparatus for video player (Hitachi) PTO
US04423500 12/27/83 Stylus lifting/lowering actuator with air damping PTO
US04424630 01/10/84 Apparatus for measuring the dimensions of delicate parts PTO
US04424761 01/10/84 Nozzle for coating a disc with a lubricant PTO
US04426349 01/17/84 Process for improving dimensional stability of video disc caddy PTO
US04426695 01/17/84 Disc reproducing apparatus (Toshiba) PTO
US04428165 01/31/84 Flip-flop grinding method PTO
US04429376 01/31/84 Video disc stylus deflector system PTO
US04429678 02/07/84 Cutting stylus for mechanically cutting masters for keel-lapping PTO
US04430361 02/07/84 Apparatus and method for preparing an abrasive coated substrate PTO
US04431487 02/14/84 Matrixing apparatus and method for use in the manufacture of molded records PTO
US04432015 02/14/84 Video apparatus having improved antenna transfer switching system PTO
US04432086 02/14/84 Turntable apparatus for video disc player PTO
US04433407 02/21/84 Method and apparatus for recording video signals into a metal substrate PTO
US04433409 02/21/84 Pick-up assembly for video disc player (Sanyo) PTO
US04433794 02/28/84 Jig for machining stylus blanks PTO
US04434480 02/28/84 Automatic loading apparatus (Toshiba) PTO
US04434481 02/28/84 Traveling wave surface acoustic wave transducer PTO
US04435799 03/06/84 Disc record player having shutoff switch actuating apparatus PTO
US04435922 03/13/84 Apparatus for grinding the back surfaces of record molding stampers PTO
US04436603 03/13/84 Apparatus for separating a replica from a matrix PTO
US04437641 03/20/84 Mold for recorded disc PTO
US04439128 03/27/84 Apparatus for molding a recorded disc having a molded-in center hole PTO
US04439851 03/27/84 Turntable lifting apparatus of a video disc player (Toshiba) PTO
US04439852 03/27/84 Disc player having record handling apparatus PTO
US04439853 03/27/84 Capacitive playback stylus PTO
US04439854 03/27/84 Video disc stylus PTO
US04439855 03/27/84 Capacitive playback stylus PTO
US04440604 04/03/84 Method for the manufacture of lapping disc for forming keels on videodisc styli PTO
US04441176 04/03/84 Damping mechanism for a video disc stylus holder PTO
US04442517 04/10/84 Stylus protecting mechanism for video disc player PTO
US04443871 04/17/84 Stylus lowering, lifting and cleaning apparatus PTO
US04443872 04/17/84 Video disc player having caddy lockout mechanism PTO
US04444820 04/24/84 High density information disc lubricants PTO
US04445995 05/01/84 Cathode head having improved seal means PTO
US04447381 05/08/84 Apparatus and method for making a video disc PTO
US04450548 05/22/84 Disc record player having stylus cleaner PTO
US04450550 05/22/84 Pickup circuit for video disc including dual-gate FET with injected RF PTO
US04450551 05/22/84 Keel-tipped stylus, and method and device for making keel-tipped stylus (Sanyo) PTO
US04450552 05/22/84 Linear velocity control means PTO
US04450787 05/29/84 Glow discharge plasma deposition of thin films PTO
US04451912 05/29/84 Record extraction mechanism for disc player PTO
US04453240 06/05/84 Video disc player having caddy overtravel mechanism PTO
US04453242 06/05/84 Surface acoustic wave cutterhead for disc recording having a circular transducer PTO
US04455335 06/19/84 High density information disc lubricants PTO
US04455633 06/19/84 Method for evaluating distortions in video disc recordings PTO
US04455638 06/19/84 RF Radial choke for use in record playback apparatus PTO
US04456636 06/26/84 Method of applying high-density information record lubricants PTO
US04459692 07/10/84 Signal pickup cartridge PTO
US04460656 07/17/84 Video disc preform and method of making a disc therefrom PTO
US04461386 07/24/84 Rack for transporting recorded discs PTO
US04462048 07/24/84 Noise reduction circuitry for audio signals PTO
US04462780 07/31/84 Injection molding apparatus PTO
US04463849 08/07/84 Video disc caddy PTO
US04463850 08/07/84 Video disc caddy PTO
US04464742 08/07/84 Stylus cleaner pad orientation in disc record player PTO
US04464744 08/07/84 Video disc player having turntable retention mechanism PTO
US04465616 08/14/84 Formulation of electrically conductive plastics PTO
US04465617 08/14/84 Method for preparing a molding composition PTO
US04466090 08/14/84 Radial transmission cancellation device PTO
US04466555 08/21/84 Jig for use in machining stylus blanks PTO
US04467466 08/21/84 Video disk player having door lock mechanism PTO
US04468290 08/28/84 Apparatus for attaching a matrix to an electroforming device and method therefor PTO
US04468764 08/28/84 Disc reproducing apparatus (Toshiba) PTO
US04470795 09/11/84 Apparatus for manufacturing a disc record package PTO
US04470940 09/11/84 Method for the manufacture of capacitive electronic discs PTO
US04471341 09/11/84 Pipe-lined CCD analog-to-digital converter PTO
US04471478 09/11/84 Video disc player having carriage locking mechanism PTO
US04472295 09/18/84 Conductive molding composition and discs therefrom PTO
US04472337 09/18/84 Video disc processing PTO
US04472796 09/18/84 Disc record player having carriage locking apparatus PTO
US04475966 10/09/84 Method and apparatus for manufacturing video disc caddy PTO
US04476994 10/16/84 Lid latching apparatus PTO
US04477841 10/16/84 Video player with caption generator having character background provisions PTO
US04477891 10/16/84 Multi-bandwidth optical playback apparatus having minimum baseband distortion PTO
US04477892 10/16/84 Surface acoustic wave device having a pyramid shaped tip for recording video information on a substrate PTO
US04478566 10/23/84 Apparatus for injection molding an article PTO
US04479209 10/23/84 Apparatus for reproducing signals recorded on a disk (Toshiba) PTO
US04479851 10/30/84 Purification of video disc lubricant additives PTO
US04479853 10/30/84 Method for the manufacture of record stampers PTO
US04481429 11/06/84 Bias supply for A.C. line powered apparatus PTO
US04481614 11/06/84 Velocity correction apparatus for disc record player PTO
US04481616 11/06/84 Scanning capacitance microscope PTO
US04481619 11/06/84 Turntable apparatus (Toshiba) PTO
US04482992 11/13/84 Skip/arm servo system for a video disc player (Hitachi) PTO
US04484174 11/20/84 Video disc player having improved squelch system PTO
US04485465 11/27/84 Video disc player having turntable brake mechanism PTO
US04486325 12/04/84 High-density information disc lubricants PTO
US04486872 12/04/84 In-arm stylus cleaner for disc record player PTO
US04486874 12/04/84 Carriage-actuated disc handling apparatus for video disc player PTO
US04486875 12/04/84 Video disc player having lifter driving circuit PTO
US04488278 12/11/84 Coding system for digital audio disc record PTO
US04488280 12/11/84 Video disc player having improved caddy extraction mechanism PTO
US04488282 12/11/84 Damping material PTO
US04488283 12/11/84 Epoxy resin PTO
US04488285 12/11/84 Stylus lifter locking mechanism for video disc player PTO
US04489407 12/18/84 Disk reproducing apparatus (Toshiba) PTO
US04490815 12/25/84 Actuator for use in a pickup device for a video disk player PTO
US04490945 01/01/85 Stylus manufacturing apparatus and method PTO
US04493070 01/08/85 Video disc player having carriage drive mechanism PTO
US04494052 01/15/85 DC Motor servo system PTO
US04499995 02/19/85 Video disc package PTO
US04500393 02/19/85 Method for the manufacture of record stampers PTO
US04501063 02/26/85 Stylus arm insertion apparatus PTO
US04502135 02/26/85 Pickup cartridge having improved stylus flylead PTO
US04503550 03/05/85 Dynamic CCD input source pulse generating circuit PTO
US04503806 03/12/85 Lubricant detector and measuring device PTO
US04504940 03/12/85 Stylus for use with video disc and method of grinding such stylus (Hitachi) PTO
US04504941 03/12/85 Stylus cartridge having stylus arm restraint PTO
US04507591 03/26/85 Linear pulse width to current converter for brushless DC motors PTO
US04507769 03/26/85 Disc reproducing apparatus (Toshiba) PTO
US04507770 03/26/85 Control system for a disc player apparatus (Toshiba) PTO
US04507771 03/26/85 Motor drive apparatus (Toshiba) PTO
US04509181 04/02/85 CCD charge subtraction arrangement PTO
US04510522 04/09/85 CCD Comb filter employing floating gate subtractor techniques PTO
US04512284 04/23/85 Glow discharge apparatus for use in coating a disc-shaped substrate PTO
US04512455 04/23/85 Disc turnover device PTO
US04512916 04/23/85 Video disc molding composition PTO
US04513410 04/23/85 Pickup cartridge having stylus holder PTO
US04514192 04/30/85 Silicon oxide lapping coatings PTO
US04515830 05/07/85 Solvent-cast capacitive high density information disc PTO
US04516232 05/07/85 Video disc player with compensation for stylus holder mechanical resonance PTO
US04516233 05/07/85 Disc record player having player control apparatus PTO
US04516301 05/14/85 Method and apparatus for removing flash from a molded recorded disc PTO
US04517117 05/14/85 Stabilizers for CED compositions PTO
US04519767 05/28/85 Transfer apparatus for a record molding press PTO
US04520402 05/28/85 Video apparatus with burst locked heterodyne chroma converter and residual time base error correction PTO
US04522659 06/11/85 Method and apparatus for the manufacture of record stampers PTO
US04522747 06/11/85 Capacitance electronic disc molding compositions PTO
US04523105 06/11/85 Full wave rectifier circuit for small signals PTO
US04523850 06/18/85 System for positioning a body PTO
US04524109 06/18/85 Record turntable and polymeric coating thereon PTO
US04525402 06/25/85 High-density information disc lubricants PTO
US04525751 06/25/85 Disc record with tapered groove PTO
US04528213 07/09/85 EMI/RFI Shielding composition PTO
US04532074 07/30/85 Capacitance electronic disc molding composition PTO
US04532095 07/30/85 Method of making a video disc from a disc preform PTO
US04532737 08/06/85 Method for lapping diamond PTO
US04534844 08/13/85 Electroforming apparatus PTO
US04536238 08/20/85 Method and apparatus for aligning a chuck for holding an information containing disc stylus PTO
US04536794 08/20/85 Television receiver having different receiver synchronizing characteristics in response to television signal PTO
US04540615 09/10/85 High-density information disc lubricant PTO
US04541716 09/17/85 Detection of defects in a circular or spiral diffraction grating PTO
US04546389 10/08/85 Video disc encoding and decoding system providing intra-field track error correction PTO
US04549228 10/22/85 Video disc encoding and decoding system providing intra-field track error correction PTO
US04550348 10/29/85 Video disc player skip/arm servo system (Hitachi) PTO
US04551212 11/05/85 Bath and process for the electrodeposition of micromachinable copper and additive for said bath PTO
US04551770 11/05/85 Video disc encoding and decoding system providing intra-field track error correction PTO
US04554582 11/19/85 Apparatus for synchronizing a source of computer controlled video to another video source PTO
US04557040 12/10/85 Alignment and insertion apparatus for an information-containing disc stylus PTO
US04557885 12/10/85 Method of producing capacitive electronic discs PTO
US04557886 12/10/85 Method of producing capacitive electronic discs PTO
US04558352 12/10/85 Sampled data vertical detail signal processor PTO
US04560274 12/24/85 Optical alignment for workpiece PTO
US04560601 12/24/85 High-density information disc lubricants PTO
US04560853 12/24/85 Positioning and bonding a diamond to a stylus shank PTO
US04561087 12/24/85 Conductive video disc PTO
US04561215 12/31/85 Stylus lapping control PTO
US04562487 12/31/85 Video disc encoding and decoding system providing intra-infield track error correction PTO
US04563761 01/07/86 Resonator assembly having direct current component bypass means for use in a video disk player (Sanyo) PTO
US04566224 01/28/86 Lapping apparatus PTO
US04567532 01/28/86 Selectable view video record/playback system (Sanders) PTO
US04571640 02/18/86 Video disc program branching system (Sanders) PTO
US04572841 02/25/86 Low temperature method of deposition silicon dioxide PTO
US04573085 02/25/86 Video disc system having true and complemented digital auxiliary information codes PTO
US04574306 03/04/86 Apparatus and method for automatically measuring the shoe-length of a video disc stylus PTO
US04575759 03/11/86 Component video interconnection apparatus PTO
US04575770 03/11/86 Video disc data systems for interactive applications PTO
US04575834 03/11/86 Method of improving the signal-to-noise ratio in a capacitance electronic disc system PTO
US04575838 03/11/86 Sandwich-type capacitive electronic discs PTO
US04576829 03/18/86 Low temperature growth of silicon dioxide on silicon PTO
US04578787 03/25/86 Record disc reproducing apparatus (Hitachi) PTO
US04580253 04/01/86 Direct access apparatus and method for video disc player (Toshiba) PTO
US04581644 04/08/86 Video bus PTO
US04581645 04/08/86 Distributed switched component audio/video system PTO
US04587570 05/06/86 Stylus kicker having kick energy minimization means PTO
US04592041 05/27/86 Head for recording an information signal in and reproducing the same from a semiconductor recording medium (Toshiba) PTO
US04597646 07/01/86 Apparatus for positioning a stylus PTO
US04598997 07/08/86 Apparatus and method for detecting defects and dust on a patterned surface PTO
US04599564 07/08/86 Tubular semiconductor magnetic field sensor and circuits for use therewith PTO
US04601581 07/22/86 Method and apparatus of determining the true edge length of a body PTO
US04602359 07/22/86 Method for determining variations from flatness in the topography of a disc surface PTO
US04603512 08/05/86 Apparatus for lapping a facet on a tip of a workpiece PTO
US04609094 09/02/86 Apparatus for sorting cylindrical work pieces having a longitudinal flat according to their rotational orientation PTO
US04609187 09/02/86 Positioning apparatus PTO
US04615504 10/07/86 Anti-vibration device PTO
US04623064 11/18/86 Apparatus for storage of molded discs PTO
US04641205 02/03/87 Television system scheduler with on-screen menu type programming prompting apparatus PTO
US04647973 03/03/87 Switch apparatus for a video interconnection system PTO
US05175724 12/29/92 Capacitance disc information retrieval system (New Vision Technologies) PTO
US05285439 02/08/94 High density ced data storage (New Vision Technologies) PTO
USD0256117 07/29/80 Video disc player PTO
USD0264712 06/01/82 Video disc player PTO
USD0264713 06/01/82 Video disc player PTO
USD0270154 08/16/83 Video disk player (Hitachi) PTO
USD0270442 09/06/83 Video disc player PTO
USD0274905 07/31/84 Video disc caddy PTO
USD0275566 09/18/84 Video disc player PTO
USD0275668 09/25/84 Video disc player PTO
USRE029113 01/11/77 Triangular piezoelectric transducer for recording video information PTO
USRE031223 04/26/83 Track skipper for video disc player PTO
USRE031235 05/10/83 Method for producing injection molded and centrally apertured disc records PTO
USRE031326 07/26/83 Signal translating apparatus for composite signal subject to jitter PTO
USRE031612 06/26/84 CCD Input circuits PTO
USRE032457 07/07/87 Scanning capacitance microscope PTO
UST0953002 12/07/76 Optical videodisc playback system with plural photodetectors PTO

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