Inventor · disambiguated record
Seiji Yonezawa
Also filed as: MIYAUCHI TOSHIMITSU · YONEZAWA SEIJI
48 granted patents·1,442 citations·filing 1976–2022
99Inventor score
Top patents by PatentIndex Score
48 records- 0198US4866688AComposite tracking servo system for optical disc apparatus with track offset correctionHITACHI LTD·Filed 1986·Granted Sep 12, 1989·111 cites·20 claims
- 0298US4748609AMethod and apparatus for composite tracking servo system with track offset correction and rotary optical disc having at least one correction mark for correcting track offsetHITACHI LTD·Filed 1986·Granted May 31, 1988·119 cites·21 claims
- 0397US4791627AWobbled pit recording method and device of optical recording medium utilizing a plurality of time different signal waveformsHITACHI LTD·Filed 1986·Granted Dec 13, 1988·77 cites·10 claims
- 0497US4707816AMethod and apparatus for composite wobbled and push-pull tracking servo systemHITACHI LTD·Filed 1986·Granted Nov 17, 1987·98 cites·13 claims
- 0597US4357616ARecording mediumHITACHI LTD·Filed 1980·Granted Nov 2, 1982·72 cites·13 claims
- 0695US5959943AInformation recording medium with clock information thereinHITACHI LTD·Filed 1997·Granted Sep 28, 1999·69 cites·2 claims
- 0795US5150339AOptical disk medium and its application method and systemHITACHI LTD·Filed 1990·Granted Sep 22, 1992·87 cites·19 claims
- 0891US5537282AData storage disk having improved tracking capabilityFiled 1994·Granted Jul 16, 1996·54 cites·28 claims
- 0990US4333173AOptical information processor with prismatic correction of laser beam shapeHITACHI LTD·Filed 1980·Granted Jun 1, 1982·61 cites·29 claims
- 1089US5348837AProjection exposure apparatus and pattern forming method for use therewithHITACHI LTD·Filed 1993·Granted Sep 20, 1994·73 cites·15 claims
- 1189US4785442ALight spot position control system and method by sampling servoHITACHI LTD·Filed 1987·Granted Nov 15, 1988·38 cites·7 claims
- 1289US4392219AMethod and device for recording and reproducing tracking informationHITACHI LTD·Filed 1981·Granted Jul 5, 1983·33 cites·10 claims
- 1389US4067044AInformation recording and retrieval apparatusHITACHI LTD·Filed 1976·Granted Jan 3, 1978·59 cites·20 claims
- 1487US4564929AInformation recording and reproducing apparatus with tracking control by samplingHITACHI LTD·Filed 1982·Granted Jan 14, 1986·30 cites·14 claims
- 1586US4238803AInformation recording methods using lasersHITACHI LTD·Filed 1977·Granted Dec 9, 1980·27 cites·35 claims
- 1685US4703408AApparatus and record carrier for optically writing informationHITACHI LTD·Filed 1984·Granted Oct 27, 1987·27 cites·20 claims
- 1783US4364118AOptical disk and optical information processorHITACHI LTD·Filed 1980·Granted Dec 14, 1982·24 cites·6 claims
- 1881US4411500AOptical system for reproducing informationHITACHI LTD·Filed 1980·Granted Oct 25, 1983·22 cites·11 claims
- 1980US5134426AOptical device for generating pattern having uniform light intensity distributionHITACHI LTD·Filed 1990·Granted Jul 28, 1992·29 cites·11 claims
- 2080US4748611AInformation recording medium and method for reproducing the sameHITACHI LTD·Filed 1986·Granted May 31, 1988·29 cites·2 claims
- 2178US4949325AMethod and associated apparatus and medium for optical recording and reproducing informationHITACHI LTD·Filed 1988·Granted Aug 14, 1990·22 cites·13 claims
- 2277US5170383AMagneto-optical data recording systemHITACHI LTD·Filed 1989·Granted Dec 8, 1992·13 cites·23 claims
- 2376US5296995AMethod of magnetically recording and reading data, magnetic recording medium, its production method and magnetic recording apparatusHITACHI LTD·Filed 1993·Granted Mar 22, 1994·58 cites·23 claims
- 2475US4223187AMethod and apparatus for recording and reproducing a video-disc with an oscillated trackHITACHI LTD·Filed 1977·Granted Sep 16, 1980·17 cites·32 claims
- 2574US4872152ALight spot position control system and method by sampled servoHITACHI LTD·Filed 1987·Granted Oct 3, 1989·18 cites·8 claims
- 2674US4857744AOptical projection printing apparatus wherein wafer mark has a grating pitch in the sagittal plane of the first optical systemHITACHI LTD·Filed 1988·Granted Aug 15, 1989·22 cites·12 claims
- 2767US4759628AWavelength scanning interferometry and interferometer employing laser diodeHITACHI LTD·Filed 1986·Granted Jul 26, 1988·25 cites·11 claims
- 2867US4407880ASubstrate of member for recording information with light and method of manufacturing the sameHITACHI LTD·Filed 1980·Granted Oct 4, 1983·13 cites·15 claims
- 2961US4504937AOptical information tracking apparatusHITACHI LTD·Filed 1982·Granted Mar 12, 1985·11 cites·7 claims
- 3059US6122229AMagneto-optically recorded data readout systemYONEZAWA SEIJI·Filed 1998·Granted Sep 19, 2000·15 cites·3 claims
- 3159US5473581AMagneto-optical data recording system continuously irradiating optical pulsersHITACHI LTD·Filed 1992·Granted Dec 5, 1995·7 cites·15 claims
- 3258US4710909APhase compensation apparatus for an optical information recording and reproducing systemHITACHI LTD·Filed 1985·Granted Dec 1, 1987·11 cites·9 claims
- 3356US12420012B2Infusion setCOMETS INC·Filed 2022·Granted Sep 23, 2025·0 cites·5 claims
- 3453US4688880AHologram lensHITACHI LTD·Filed 1984·Granted Aug 25, 1987·11 cites·12 claims
- 3553US4541082ADevice for optically tracking informationHITACHI LTD·Filed 1982·Granted Sep 10, 1985·8 cites·10 claims
- 3652US6614737B2Optical reproduction method and optical information deviceHITACHI LTD·Filed 2002·Granted Sep 2, 2003·1 cites·5 claims
- 3752US4646279AOptical disk cutting apparatus using multiple beamsHITACHI LTD·Filed 1985·Granted Feb 24, 1987·8 cites·14 claims
- 3850US4235507AOptical system to condense light from a semiconductor laser into a circular spotHITACHI LTD·Filed 1978·Granted Nov 25, 1980·10 cites·6 claims
- 3947US11701466B2Infusion setCOMETS INC·Filed 2020·Granted Jul 18, 2023·0 cites·3 claims
- 4047US5726955AMagneto optical recording medium apparatus and method utilizing light pulse magnetic modulation recordingHITACHI LTD·Filed 1996·Granted Mar 10, 1998·4 cites·9 claims
- 4145US4296419AMember for recording informationHITACHI LTD·Filed 1979·Granted Oct 20, 1981·7 cites·20 claims
- 4244US5886958AInformation recording apparatus and method for modulated magneto-optical recording mediumHITACHI LTD·Filed 1997·Granted Mar 23, 1999·3 cites·10 claims
- 4343US6442120B2Optical reproduction method and optical information deviceHITACHI LTD·Filed 2001·Granted Aug 27, 2002·0 cites·6 claims
- 4441US4348461ARecording memberHITACHI LTD·Filed 1980·Granted Sep 7, 1982·7 cites·7 claims
- 4539US5579292AMagneto-optical data recording apparatus using a sample-servo system for applying heating pulses to record dataHITACHI LTD·Filed 1995·Granted Nov 26, 1996·2 cites·64 claims
- 4639US4847822AOptical information recording and reproducing apparatus with tracking control by samplingHITACHI LTD·Filed 1987·Granted Jul 11, 1989·4 cites·10 claims
- 4739US4241240AOptical information recording apparatusHITACHI LTD·Filed 1978·Granted Dec 23, 1980·3 cites·1 claims
- 4837US6205098B1Optical reproduction method and optical information apparatusHITACHI LTD·Filed 1996·Granted Mar 20, 2001·3 cites·11 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →