Inventor · disambiguated record
Seiichi Ohsawa
Also filed as: OHSAWA SEIICHI
21 granted patents·2 pending applications·493 citations·filing 1984–2005
95Inventor score
Top patents by PatentIndex Score
23 records- 0198US5608715AMulti-layered recording disk and recording/reproducing system using the samePIONEER ELECTRONIC CORP·Filed 1995·Granted Mar 4, 1997·273 cites·26 claims
- 0295US5258968ATracking error signal generating device for preventing offset of the generated tracking error signalPIONEER ELECTRONIC CORP·Filed 1987·Granted Nov 2, 1993·70 cites·3 claims
- 0393USRE40556EMulti-layer information recording medium and information recording and reproducing apparatusPIONEER CORP·Filed 2005·Granted Oct 28, 2008·12 cites·61 claims
- 0493USRE39463EMulti-layer information recording medium and information recording and reproducing apparatusPIONEER CORP·Filed 2005·Granted Jan 9, 2007·13 cites·44 claims
- 0593USRE39322EMulti-layer information recording medium and information recording and reproducing apparatusPIONEER CORP·Filed 2005·Granted Oct 3, 2006·13 cites·29 claims
- 0670US6418104B1Tilt detectorPIONEER CORP·Filed 1999·Granted Jul 9, 2002·22 cites·12 claims
- 0769US6773781B2Multi-layer information recording medium and information recording and reproducing apparatusPIONEER CORP·Filed 2002·Granted Aug 10, 2004·5 cites·11 claims
- 0863US5381391AOptical recording medium having a third non-linear optical reflection filmPIONEER ELECTRONIC CORP·Filed 1993·Granted Jan 10, 1995·14 cites·2 claims
- 0956US4774882AMethod for controlling printing impact power in impact type dot printerCITIZEN WATCH CO LTD·Filed 1987·Granted Oct 4, 1988·9 cites·4 claims
- 1054US5546372AInformation detection light intensity control apparatus in optical disc recorded-information reproducing apparatusPIONEER ELECTRONIC CORP·Filed 1994·Granted Aug 13, 1996·9 cites·8 claims
- 1154US5365052AOptical information reading apparatus with controlled numerical aperture relationship between focusing and receiving optical systemsPIONEER ELECTRONIC CORP·Filed 1993·Granted Nov 15, 1994·9 cites·4 claims
- 1251US4874221AFibre-type light wavelength conversion devicePIONEER ELECTRONIC CORP·Filed 1989·Granted Oct 17, 1989·13 cites·4 claims
- 1350US7190664B2High density optical recording medium and method for reproducing thereofPIONEER CORP·Filed 2001·Granted Mar 13, 2007·1 cites·6 claims
- 1448US5615206AOptical diskPIONEER ELECTRONIC CORP·Filed 1995·Granted Mar 25, 1997·8 cites·5 claims
- 1542US4650348AMethod of dot-printing underlinesCITIZEN WATCH CO LTD·Filed 1984·Granted Mar 17, 1987·4 cites·2 claims
- 1640US2003086360A1Optical disk, copy preventive method, and recordable optical diskPIONEER CORP·Filed 2002·Application pending·0 cites
- 1739US8111594B2Optical disk drive and optical pickup having aberration correction meansIWASAKI MASAYUKI·Filed 2005·Granted Feb 7, 2012·0 cites·5 claims
- 1839US4919511AFibre-type light conversion devicePIONEER ELECTRONIC CORP·Filed 1989·Granted Apr 24, 1990·7 cites·8 claims
- 1939US4757760AWire mask for a dot printer head apparatusCITIZEN WATCH CO LTD·Filed 1985·Granted Jul 19, 1988·5 cites·1 claims
- 2038US2002080713A1Optical disc having pits of desired taper anglePIONEER CORP·Filed 2001·Application pending·0 cites
- 2137US4527921APaper feed apparatus for shuttle printerCITIZEN WATCH CO LTD·Filed 1984·Granted Jul 9, 1985·3 cites·2 claims
- 2236US4852480ADot line printer with individually replaceable printing headCITIZEN WATCH CO LTD·Filed 1989·Granted Aug 1, 1989·3 cites·2 claims
- 2330US5455817ASecond harmonics generating optical recording layerPIONEER ELECTRONIC CORP·Filed 1993·Granted Oct 3, 1995·0 cites·13 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →