Inventor · disambiguated record
Tsutomu Ishikawa
Also filed as: ISHIKAWA TSUTOMU
60 granted patents·19 pending applications·466 citations·filing 1987–2024
98Inventor score
Files withSANYO ELECTRIC CO18SUMITOMO ELECTRIC INDUSTRIES13EUDYNA DEVICES INC10ISHIKAWA TSUTOMU9FUJITSU LTD5
Top patents by PatentIndex Score
79 records- 0197US6426515B2Semiconductor light-emitting deviceFUJITSU LTD·Filed 2001·Granted Jul 30, 2002·105 cites·31 claims
- 0289US10541352B2Methods for growing light emitting devices under ultra-violet illuminationLUMILEDS LLC·Filed 2017·Granted Jan 21, 2020·4 cites·9 claims
- 0387US11069836B2Methods for growing light emitting devices under ultra-violet illuminationLUMILEDS LLC·Filed 2019·Granted Jul 20, 2021·3 cites·6 claims
- 0480US9025628B2Semiconductor laserSUMITOMO ELECTRIC INDUSTRIES·Filed 2013·Granted May 5, 2015·4 cites·11 claims
- 0579US7940819B2Tunable laser module, tunable laser apparatus and controlling method for tunable laserFUJITSU LTD·Filed 2009·Granted May 10, 2011·5 cites·20 claims
- 0679US4933768ASound reproducerSANYO ELECTRIC CO·Filed 1989·Granted Jun 12, 1990·43 cites·13 claims
- 0775US7812594B2Optical device and method of controlling the sameEUDYNA DEVICES INC·Filed 2008·Granted Oct 12, 2010·4 cites·18 claims
- 0873US8457166B2Method of controlling wavelength-tunable laserSEDI INC·Filed 2012·Granted Jun 4, 2013·2 cites·6 claims
- 0972US8311068B2Method of controlling wavelength-tunable laserSHIBATA MASAO·Filed 2011·Granted Nov 13, 2012·3 cites·5 claims
- 1072US6252252B1Optical semiconductor device and optical semiconductor module equipped with the sameSANYO ELECTRIC CO·Filed 1999·Granted Jun 26, 2001·47 cites·14 claims
- 1171US6925103B2Gain-coupled DFB laser diodeFUJITSU LTD·Filed 2002·Granted Aug 2, 2005·11 cites·12 claims
- 1269US8681826B2Method for tuning semiconductor laserTANAKA HIROKAZU·Filed 2011·Granted Mar 25, 2014·2 cites·11 claims
- 1369US7813391B2Method of controlling semiconductor laserEUDYNA DEVICES INC·Filed 2008·Granted Oct 12, 2010·3 cites·8 claims
- 1468US2024178634A1Wavelength tunable laser device and method of manufacturing the sameSUMITOMO ELECTRIC INDUSTRIES·Filed 2023·Application pending·0 cites
- 1567US7515779B2Optical semiconductor deviceEUDYNA DEVICES INC·Filed 2007·Granted Apr 7, 2009·2 cites·13 claims
- 1665US7929581B2Testing method of wavelength-tunable laser, controlling method of wavelength-tunable laser and laser deviceEUDYNA DEVICES INC·Filed 2008·Granted Apr 19, 2011·2 cites·8 claims
- 1765US4825444ALaser emission materialLION CORP·Filed 1988·Granted Apr 25, 1989·14 cites·2 claims
- 1864US11480843B2Optical transmitter, method for controlling the same, and non-transitory computer-readable mediumSUMITOMO ELECTRIC INDUSTRIES·Filed 2021·Granted Oct 25, 2022·0 cites·7 claims
- 1964US6771112B1Semiconductor integrated circuit having pads with less input signal attenuationSANYO ELECTRIC CO·Filed 2000·Granted Aug 3, 2004·12 cites·7 claims
- 2063US4905283ASurround decoderSANYO ELECTRIC CO·Filed 1989·Granted Feb 27, 1990·20 cites·5 claims
- 2161US11353728B2Optical modulatorSUMITOMO ELECTRIC INDUSTRIES·Filed 2020·Granted Jun 7, 2022·0 cites·14 claims
- 2261US8194710B2Semiconductor laser with heaterISHIKAWA TSUTOMU·Filed 2009·Granted Jun 5, 2012·1 cites·11 claims
- 2361US7362782B2Optical semiconductor device and controlling method of the sameEUDYNA DEVICES INC·Filed 2007·Granted Apr 22, 2008·1 cites·8 claims
- 2461US2025020866A1Optical filter, method of manufacturing an optical filter, method of designing, design apparatus, and non-transitory computer-readable recording mediumSUMITOMO ELECTRIC INDUSTRIES·Filed 2024·Application pending·0 cites
- 2560US7474684B2Optical semiconductor element and optical semiconductor deviceEUDYNA DEVICES INC·Filed 2007·Granted Jan 6, 2009·1 cites·7 claims
- 2660US2025085462A1Optical filter, method of manufacturing optical filter, method of designing, design apparatus, and non-transitory computer-readable recording mediumSUMITOMO ELECTRIC INDUSTRIES·Filed 2024·Application pending·0 cites
- 2759US11868021B2Method for manufacturing optical modulator, testing method, non-transitory storage medium, and light transmission apparatusSUMITOMO ELECTRIC INDUSTRIES·Filed 2022·Granted Jan 9, 2024·0 cites·10 claims
- 2859US6560266B2Distributed feedback semiconductor laserFUJITSU LTD·Filed 2001·Granted May 6, 2003·5 cites·16 claims
- 2958US11048140B2Optical modulatorSUMITOMO ELECTRIC INDUSTRIES·Filed 2019·Granted Jun 29, 2021·0 cites·8 claims
- 3057US12321076B2Method for manufacturing optical modulator, testing method, non-transitory storage medium, and light transmission apparatusSUMITOMO ELECTRIC INDUSTRIES·Filed 2022·Granted Jun 3, 2025·0 cites·10 claims
- 3157US8684703B2Reciprocating compressorIKEDA HIROSHI·Filed 2009·Granted Apr 1, 2014·0 cites·1 claims
- 3256US9595808B2Method to determine operating conditions of wavelength tunable laser diode and to control optical transmitter providing wavelength tunable laser diodeSUMITOMO ELECTRIC INDUSTRIES·Filed 2015·Granted Mar 14, 2017·0 cites·4 claims
- 3356US9184561B2Method to determine operating conditions of wavelength tunable laser diode and to control optical transmitter providing wavelength tunable laser diodeSUMITOMO ELECTRIC INDUSTRIES·Filed 2014·Granted Nov 10, 2015·0 cites·5 claims
- 3456US2024418938A1Optical filterSUMITOMO ELECTRIC INDUSTRIES·Filed 2024·Application pending·0 cites
- 3556US2024178635A1Control method and control device of wavelength tunable laser device, and non-transitory storage medium storing control program of wavelength tunable laser deviceSUMITOMO ELECTRIC INDUSTRIES·Filed 2023·Application pending·0 cites
- 3655US7656927B2Optical semiconductor element and optical semiconductor deviceEUDYNA DEVICES INC·Filed 2008·Granted Feb 2, 2010·0 cites·2 claims
- 3755US6606174B1Optical semiconductor deviceSANYO ELECTRIC CO·Filed 1999·Granted Aug 12, 2003·24 cites·12 claims
- 3855US4793862ASilica-based antimony containing film-forming compositionTOKYO OHKA KOGYO CO LTD·Filed 1987·Granted Dec 27, 1988·20 cites·32 claims
- 3955US2010091805A1Optical semiconductor element and optical semiconductor deviceEUDYNA DEVICES INC·Filed 2009·Application pending·0 cites
- 4054US7196347B2Semiconductor light emitting deviceROHM CO LTD·Filed 2004·Granted Mar 27, 2007·5 cites·2 claims
- 4154US4914680ASignal distinction circuitSANYO ELECTRIC CO·Filed 1988·Granted Apr 3, 1990·14 cites·6 claims
- 4252US2015340840A1Semiconductor laserROHM CO LTD·Filed 2015·Application pending·0 cites
- 4351US8101957B2Optical semiconductor device, laser chip and laser moduleISHIKAWA TSUTOMU·Filed 2007·Granted Jan 24, 2012·0 cites·3 claims
- 4451US4980915ACenter mode control circuitSANYO ELECTRIC CO·Filed 1989·Granted Dec 25, 1990·11 cites·5 claims
- 4551US2007228550A1Optical Semiconductor deviceEUDYNA DEVICES INC·Filed 2007·Application pending·0 cites
- 4650US10889557B1Method of producing an alkoxyflavone derivativeTOKIWA PHYTOCHEMICAL CO LTD·Filed 2019·Granted Jan 12, 2021·0 cites·3 claims
- 4750US8563991B2Optical semiconductor device, laser chip and laser moduleISHIKAWA TSUTOMU·Filed 2011·Granted Oct 22, 2013·0 cites·5 claims
- 4850US2011300009A1Method of Processing Contact Portions between Valve Plate and Suction Valve and/or Discharge Valve of Reciprocating Compressor, and Reciprocating CompressorKIKUCHI KIYOTO·Filed 2009·Application pending·0 cites
- 4949US5165099ABalance control circuitSANYO ELECTRIC CO·Filed 1991·Granted Nov 17, 1992·14 cites·12 claims
- 5047US9011109B2Variable Capacity CompressorISHIKAWA TSUTOMU·Filed 2011·Granted Apr 21, 2015·0 cites·5 claims
Showing the top 50 of 79 patent records by PatentIndex Score.
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