Assignee
UNIVERSAL PIONEER CORP
JP·33 granted patents·458 citations·filing 1979–1984
Top patents by PatentIndex Score
33 records- 0189US4268745ATracking servo drawing device in optical type information reading deviceUNIVERSAL PIONEER CORP·Filed 1979·Granted May 19, 1981·29 cites·7 claims
- 0287US4344165AMethod and system for a disc player tracking servoUNIVERSAL PIONEER CORP·Filed 1980·Granted Aug 10, 1982·31 cites·6 claims
- 0385US4406520ABeam splitter optical system of signal pickup deviceUNIVERSAL PIONEER CORP·Filed 1981·Granted Sep 27, 1983·29 cites·11 claims
- 0483US4475182AFocus servo control system for automatically adjusting a relative distance between an objective lens unit and a recording surface of an optical recording mediumUNIVERSAL PIONEER CORP·Filed 1981·Granted Oct 2, 1984·44 cites·6 claims
- 0578US4510592ADisk clamping deviceUNIVERSAL PIONEER CORP·Filed 1984·Granted Apr 9, 1985·31 cites·22 claims
- 0677US4340950AVideo disc playerUNIVERSAL PIONEER CORP·Filed 1980·Granted Jul 20, 1982·26 cites·13 claims
- 0776US4313129AVideo signal time base error correction circuitUNIVERSAL PIONEER CORP·Filed 1979·Granted Jan 26, 1982·31 cites·4 claims
- 0875US4280215AFocussing lens servo driving device for optical information reading deviceUNIVERSAL PIONEER CORP·Filed 1979·Granted Jul 21, 1981·16 cites·5 claims
- 0974US4494154APickup control device and method for fast or slow reproduction in a disk reading systemUNIVERSAL PIONEER CORP·Filed 1981·Granted Jan 15, 1985·18 cites·2 claims
- 1073US4390977AApparatus for maintaining rotational speed in disk reproducing deviceUNIVERSAL PIONEER CORP·Filed 1981·Granted Jun 28, 1983·20 cites·11 claims
- 1170US4564867AVideo disc recording and reproducing device for video discs having recognition signal indicative of content of associated program signalUNIVERSAL PIONEER CORP·Filed 1981·Granted Jan 14, 1986·19 cites·5 claims
- 1265US4273998AServo unit for optical type information reading deviceUNIVERSAL PIONEER CORP·Filed 1979·Granted Jun 16, 1981·11 cites·6 claims
- 1363US4476499AVideo disc recording and reproducing systemUNIVERSAL PIONEER CORP·Filed 1983·Granted Oct 9, 1984·24 cites·9 claims
- 1463US4403259AApparatus for reading information from an information recording discUNIVERSAL PIONEER CORP·Filed 1981·Granted Sep 6, 1983·14 cites·4 claims
- 1563US4367543AOptical disc player signal reading device with improved drive structure for moving optical pickup in orthogonal directionsUNIVERSAL PIONEER CORP·Filed 1980·Granted Jan 4, 1983·18 cites·13 claims
- 1654US4512002ATracking servo system of recording disc information recording and reproducing apparatusUNIVERSAL PIONEER CORP·Filed 1983·Granted Apr 16, 1985·8 cites·9 claims
- 1754US4422103ADevice for reducing the effect of time base variations in video disc playerUNIVERSAL PIONEER CORP·Filed 1981·Granted Dec 20, 1983·8 cites·7 claims
- 1853US4429378AOptical pickup device for use in a video and/or audio disc playerUNIVERSAL PIONEER CORP·Filed 1981·Granted Jan 31, 1984·8 cites·9 claims
- 1951US4498158AAddress data searching method for data recording medium reproducing deviceUNIVERSAL PIONEER CORP·Filed 1980·Granted Feb 5, 1985·8 cites·9 claims
- 2045US4415935ATangential servo control signal generating device for recorded data reproducing deviceUNIVERSAL PIONEER CORP·Filed 1980·Granted Nov 15, 1983·5 cites·9 claims
- 2144US4442516ADrive mechanism for disc player with bearing supported sliderUNIVERSAL PIONEER CORP·Filed 1981·Granted Apr 10, 1984·9 cites·16 claims
- 2244US4287413AAutomatic focus servomechanism in optical information reading deviceUNIVERSAL PIONEER CORP·Filed 1979·Granted Sep 1, 1981·7 cites·8 claims
- 2342US4512005AInformation reproducing apparatus in a recording disc playerUNIVERSAL PIONEER CORP·Filed 1982·Granted Apr 16, 1985·4 cites·3 claims
- 2442US4319278AVideo switch circuitUNIVERSAL PIONEER CORP·Filed 1980·Granted Mar 9, 1982·6 cites·3 claims
- 2538US4459621AHigh frequency crosstalk eliminating circuit in video disc reproducing deviceUNIVERSAL PIONEER CORP·Filed 1981·Granted Jul 10, 1984·4 cites·5 claims
- 2637US4425583AVideo disc player having time base variations eliminated in both audio and video signalsUNIVERSAL PIONEER CORP·Filed 1981·Granted Jan 10, 1984·4 cites·6 claims
- 2737US4261646ABeam splitter for optical playerUNIVERSAL PIONEER CORP·Filed 1979·Granted Apr 14, 1981·6 cites·4 claims
- 2836US4286147AIn-focus detecting deviceUNIVERSAL PIONEER CORP·Filed 1979·Granted Aug 25, 1981·7 cites·14 claims
- 2935US4528599AFM angular modulation system for video signal recordingUNIVERSAL PIONEER CORP·Filed 1981·Granted Jul 9, 1985·3 cites·4 claims
- 3035US4477838ATangential error signal generator in PAL type video disc playerUNIVERSAL PIONEER CORP·Filed 1981·Granted Oct 16, 1984·2 cites·6 claims
- 3131US4516160AInformation recording and reproducing systemUNIVERSAL PIONEER CORP·Filed 1982·Granted May 7, 1985·1 cites·8 claims
- 3230US4385244AExtraneous signal separating deviceUNIVERSAL PIONEER CORP·Filed 1980·Granted May 24, 1983·1 cites·9 claims
- 3324US4268129AMirror for optical recording systemUNIVERSAL PIONEER CORP·Filed 1979·Granted May 19, 1981·6 cites·15 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →