Inventor · disambiguated record
Toshiyuki Okumura
Also filed as: OKUMURA TOSHIYUKI
43 granted patents·5 pending applications·760 citations·filing 1988–2021
98Inventor score
Top patents by PatentIndex Score
48 records- 0194US6614824B2Nitride semiconductor laser device and optical device using the sameSHARP KK·Filed 2001·Granted Sep 2, 2003·52 cites·12 claims
- 0293US6787384B2Functional device, method of manufacturing therefor and driver circuitNEC CORP·Filed 2003·Granted Sep 7, 2004·51 cites·2 claims
- 0389US7356218B2Variable demultiplexerSHARP KK·Filed 2005·Granted Apr 8, 2008·35 cites·8 claims
- 0489US7274010B2Semiconductor optical amplifier device amplifying an externally applied light signal, semiconductor optical amplification driving device and semiconductor light receiving apparatusSHARP KK·Filed 2005·Granted Sep 25, 2007·17 cites·16 claims
- 0587US6456640B1Gallium nitride type semiconductor laser deviceSHARP KK·Filed 1999·Granted Sep 24, 2002·54 cites·33 claims
- 0687US6160688AMagneto-resistive composite head and a magnetic disk device, having grounded magnetic shielding layersNEC CORP·Filed 1998·Granted Dec 12, 2000·47 cites·5 claims
- 0786US7183569B2Gallium nitride semiconductor light emitting device having multi-quantum-well structure active layer, and semiconductor laser light source deviceSHARP KK·Filed 2005·Granted Feb 27, 2007·7 cites·10 claims
- 0886US5049970AHigh resistive elementSHARP KK·Filed 1990·Granted Sep 17, 1991·66 cites·4 claims
- 0985US6585800B2Method for making molten metalKOBE STEEL LTD·Filed 2002·Granted Jul 1, 2003·19 cites·5 claims
- 1080US6764870B2Method for manufacturing a gallium nitride type semiconductor laser deviceSHARP KK·Filed 2002·Granted Jul 20, 2004·12 cites·12 claims
- 1180US6556603B1Nitride-contained semiconductor laser element and optical information reproducing deviceSHARP KK·Filed 2000·Granted Apr 29, 2003·16 cites·16 claims
- 1280US6370176B1Gallium nitride group semiconductor laser device and optical pickup apparatusSHARP KK·Filed 1999·Granted Apr 9, 2002·46 cites·10 claims
- 1378US7199398B2Nitride semiconductor light emitting device having electrode electrically separated into at least two regionsSHARP KK·Filed 2003·Granted Apr 3, 2007·14 cites·18 claims
- 1476US6781208B2Functional device, method of manufacturing therefor and driver circuitNEC CORP·Filed 2002·Granted Aug 24, 2004·13 cites·17 claims
- 1575US7251390B2Planar waveguide deviceSHARP KK·Filed 2006·Granted Jul 31, 2007·8 cites·10 claims
- 1673US7864412B2Semiconductor optical amplifier device amplifying external light signal and driving apparatus thereforSHARP KK·Filed 2008·Granted Jan 4, 2011·4 cites·29 claims
- 1773US6842470B2Nitride-type compound semiconductor laser device and laser apparatus incorporating the sameSHARP KK·Filed 2002·Granted Jan 11, 2005·10 cites·9 claims
- 1872US6956882B2Gallium nitride semiconductor light emitting device having multi-quantum-well structure active layer, and semiconductor laser light source deviceSHARP KK·Filed 2002·Granted Oct 18, 2005·8 cites·11 claims
- 1970US5070510ASemiconductor laser deviceSHARP KK·Filed 1990·Granted Dec 3, 1991·50 cites·16 claims
- 2069US11105688B2Attaching a thermistor on a caseSHIBAURA ELECTRONICS CO LTD·Filed 2017·Granted Aug 31, 2021·1 cites·20 claims
- 2169US6377597B1Gallium nitride semiconductor light emitting element with active layer having multiplex quantum well structure and semiconductor laser light source deviceSHARP KK·Filed 1998·Granted Apr 23, 2002·38 cites·11 claims
- 2266US9099586B2Nitride semiconductor light-emitting element and method for producing nitride semiconductor light-emitting elementUEDA MASAYA·Filed 2012·Granted Aug 4, 2015·1 cites·11 claims
- 2365US6549552B1Nitride-type compound semiconductor laser device and laser apparatus incorporating the sameSHARP KK·Filed 1998·Granted Apr 15, 2003·24 cites·4 claims
- 2464US5841584ADielectric multilayered reflectorSHARP KK·Filed 1996·Granted Nov 24, 1998·30 cites·18 claims
- 2562US2024035114A1Zinc recovery methodCHUGAI RO KOGYO KAISHA LTD·Filed 2021·Application pending·0 cites
- 2660US5926019ASystem for evaluating the play back of magnetoresistive headsNEC CORP·Filed 1997·Granted Jul 20, 1999·14 cites·4 claims
- 2760US5031991AOptical coupling circuit elementSHARP KK·Filed 1989·Granted Jul 16, 1991·19 cites·22 claims
- 2859US7088902B2Photonic crystal and producing method thereofSHARP KK·Filed 2004·Granted Aug 8, 2006·9 cites·15 claims
- 2955US6157507APerformance evaluation method of an MR head and a magnetic disk device wherein the method is appliedNEC CORP·Filed 1998·Granted Dec 5, 2000·11 cites·8 claims
- 3053US7026698B2Functional device, method of manufacturing therefor and driver circuitDENSO CORP·Filed 2004·Granted Apr 11, 2006·3 cites·26 claims
- 3151US6714719B1Video recording system using magnetic disk driveNEC CORP·Filed 1999·Granted Mar 30, 2004·9 cites·10 claims
- 3251US5345460ASemiconductor laser device with window regionsSHARP KK·Filed 1992·Granted Sep 6, 1994·13 cites·6 claims
- 3350US5335241ABuried stripe type semiconductor laser deviceSHARP KK·Filed 1991·Granted Aug 2, 1994·13 cites·14 claims
- 3449US7015565B2Gallium nitride type semiconductor laser deviceSHARP KK·Filed 2004·Granted Mar 21, 2006·1 cites·6 claims
- 3547US4980875AMagneto-optical disk with perpendicular magnetic anisotropy film and high corrosion-resistant filmNIPPON DENKI HOME ELECTRONICS·Filed 1988·Granted Dec 25, 1990·7 cites·8 claims
- 3645US7515624B2Semiconductor laser, semiconductor laser driver and method of driving semiconductor laser reducing feedback-induced noise by modulated optical outputSHARP KK·Filed 2003·Granted Apr 7, 2009·1 cites·6 claims
- 3743US5375135ASemiconductor laser deviceSHARP KK·Filed 1993·Granted Dec 20, 1994·9 cites·8 claims
- 3843US2013010294A1Optical measurement analysis device, storage room, electromagnetic-wave generating device, and optical measurement analysis methodSHARP KK·Filed 2012·Application pending·0 cites
- 3940US2009003769A1Optical isolatorFUKAI YASUO·Filed 2008·Application pending·0 cites
- 4039US5658824AMethod of fabricating a semiconductor laser deviceSHARP KK·Filed 1995·Granted Aug 19, 1997·10 cites·5 claims
- 4139US5182758APeriodic gain-type semiconductor laser deviceSHARP KK·Filed 1991·Granted Jan 26, 1993·6 cites·5 claims
- 4239US2004047548A1Optical switching subsystem and optical switching subsystem self-diagnosing methodNEC CORP·Filed 2003·Application pending·0 cites
- 4338US5351258ASemiconductor laser deviceSHARP KK·Filed 1993·Granted Sep 27, 1994·6 cites·12 claims
- 4436US5506856ASemiconductor laser device having a resonator of particular length for reduced threshold current densitySHARP KK·Filed 1994·Granted Apr 9, 1996·4 cites·4 claims
- 4534US2015309235A1Optical apparatus, light source apparatus, and vehicleSHARP KK·Filed 2015·Application pending·0 cites
- 4630US5448425AMethod for erasing information recorded on magnetic tape with reduced residual magnetizationNEC CORP·Filed 1994·Granted Sep 5, 1995·0 cites·4 claims
- 4729US5657337ASemiconductor laser device having a resonator of a particular length for reducing threshold current densitySHARP KK·Filed 1996·Granted Aug 12, 1997·1 cites·9 claims
- 4826US5404259AMagnetic head having high wear resistance and non-magnetic substrate used in the magnetic headNEC CORP·Filed 1992·Granted Apr 4, 1995·1 cites·10 claims
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