Inventor · disambiguated record
Masao Yoshikawa
Also filed as: YOSHIKAWA MASAO
59 granted patents·1 pending application·1,346 citations·filing 1980–2023
99Inventor score
Files withRICOH KK17CANON KK10MATSUSHITA ELECTRIC INDUSTRIAL CO LTD8SHINETSU CHEMICAL CO6FUJITSU LTD4
Top patents by PatentIndex Score
60 records- 0197US5492784APositively-chargeable single-layered type electrophotographic photoconductorRICOH KK·Filed 1993·Granted Feb 20, 1996·106 cites·9 claims
- 0295US5350459AOrganic photovoltaic elementRICOH KK·Filed 1993·Granted Sep 27, 1994·150 cites·6 claims
- 0395US4924267AProcess cartridge and multi-color image forming apparatus using sameCANON KK·Filed 1989·Granted May 8, 1990·64 cites·39 claims
- 0494US6521386B1Electrophotographic photoreceptor and electrophotographic image forming method and apparatus using the photoreceptorRICOH KK·Filed 2000·Granted Feb 18, 2003·60 cites·18 claims
- 0591US5405455ARare earth-based permanent magnetSHINETSU CHEMICAL CO·Filed 1993·Granted Apr 11, 1995·78 cites·6 claims
- 0690US4672149APhotoelectric transducer elementRICOH KK·Filed 1986·Granted Jun 9, 1987·63 cites·18 claims
- 0789US5350653AElectrophotographic photoconductorRICOH KK·Filed 1993·Granted Sep 27, 1994·28 cites·16 claims
- 0888US5013411AMethod for producing a corrosion resistant rare earth-containing magnetSHINETSU CHEMICAL CO·Filed 1989·Granted May 7, 1991·41 cites·8 claims
- 0985US6012977AAbrasive-bladed cutting wheelSHINETSU CHEMICAL CO·Filed 1997·Granted Jan 11, 2000·70 cites·8 claims
- 1084US5486438AElectrophotographic photoconductorRICOH KK·Filed 1994·Granted Jan 23, 1996·25 cites·22 claims
- 1183US6517427B1Abrasive-bladed multiple cutting wheel assemblySHINETSU CHEMICAL CO·Filed 1998·Granted Feb 11, 2003·49 cites·8 claims
- 1277USD291441STelevision receiverMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1985·Granted Aug 18, 1987·18 cites·1 claims
- 1375US5288843APolyimides, process for the preparation thereof and polyimide resin compositionsMITSUI TOATSU CHEMICALS·Filed 1990·Granted Feb 22, 1994·15 cites·42 claims
- 1475US5264048APhotoelectric conversion deviceRICOH KK·Filed 1992·Granted Nov 23, 1993·42 cites·4 claims
- 1574US5201961APhotovoltaic device containing organic material layers and having high conversion efficiencyRICOH KK·Filed 1991·Granted Apr 13, 1993·52 cites·8 claims
- 1674US4992109APhotoelectric conversion elementRICOH KK·Filed 1989·Granted Feb 12, 1991·28 cites·22 claims
- 1774US4937630AImage forming apparatus employing non-magnetic and magnetic tonerCANON KK·Filed 1987·Granted Jun 26, 1990·18 cites·26 claims
- 1873US5715022AImage display apparatusSHARP KK·Filed 1994·Granted Feb 3, 1998·29 cites·25 claims
- 1973US4874481AN,N'-diphenylbenzidine polymer and method of producing the sameRICOH KK·Filed 1988·Granted Oct 17, 1989·22 cites·15 claims
- 2072USD624954SEyeglassesPANASONIC CORP·Filed 2010·Granted Oct 5, 2010·18 cites·1 claims
- 2172US5840375AMethod for the preparation of a highly corrosion resistant rare earth based permanent magnetSHINETSU CHEMICAL CO·Filed 1996·Granted Nov 24, 1998·28 cites·9 claims
- 2272US5006915AElectric device and photoelectric conversion device comprising the sameRICOH KK·Filed 1990·Granted Apr 9, 1991·27 cites·12 claims
- 2372US4774543AImage forming apparatus with plural developing devicesCANON KK·Filed 1987·Granted Sep 27, 1988·19 cites·16 claims
- 2471US9755888B2Information processing device, information processing system, and communication deviceFUJITSU LTD·Filed 2015·Granted Sep 5, 2017·2 cites·10 claims
- 2571US9073318B2Method of manufacturing liquid discharge headCANON KK·Filed 2014·Granted Jul 7, 2015·1 cites·13 claims
- 2671US5387487AElectrophotographic photoconductorRICOH KK·Filed 1992·Granted Feb 7, 1995·19 cites·7 claims
- 2768US4831408AElectrophotographic apparatus capable of forming images in different colorsCANON KK·Filed 1987·Granted May 16, 1989·15 cites·14 claims
- 2867US4413899ACopying method and apparatusRICOH KK·Filed 1981·Granted Nov 8, 1983·14 cites·11 claims
- 2966US4887102AImage forming apparatusCANON KK·Filed 1988·Granted Dec 12, 1989·15 cites·20 claims
- 3065US4872418AMagnet roll developing apparatusCANON KK·Filed 1986·Granted Oct 10, 1989·13 cites·31 claims
- 3163US9893992B2Communication apparatus, information processing apparatus, and method of controlling communication apparatusFUJITSU LTD·Filed 2015·Granted Feb 13, 2018·1 cites·7 claims
- 3262US5381187AImage display apparatusSHARP KK·Filed 1992·Granted Jan 10, 1995·18 cites·8 claims
- 3361USD624955SEyeglassesPANASONIC CORP·Filed 2010·Granted Oct 5, 2010·12 cites·1 claims
- 3461USD306724STelevision receiver/monitorMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1987·Granted Mar 20, 1990·9 cites·1 claims
- 3559USD662085SRemote controller for digital video disc playerYOSHIKAWA MASAO·Filed 2011·Granted Jun 19, 2012·12 cites·1 claims
- 3658US4548489ADevice for forming a thin layer of developerCANON KK·Filed 1983·Granted Oct 22, 1985·8 cites·3 claims
- 3757US5285959AAir heating apparatusMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1992·Granted Feb 15, 1994·22 cites·27 claims
- 3854US5380820APolyimides, process for the preparation thereof and polyimide resin compositionsMITSUI TOATSU CHEMICALS·Filed 1993·Granted Jan 10, 1995·5 cites·5 claims
- 3954US2024012640A1Processor circuit, method of managing version, and computer-readable recording medium storing version managing programFUJITSU LTD·Filed 2023·Application pending·0 cites
- 4053US5326678AHigh dielectric polymeric optical recording mediumRICOH KK·Filed 1992·Granted Jul 5, 1994·9 cites·18 claims
- 4152US6224986B1Rare earth permanent magnet of high corrosion resistanceSHINETSU CHEMICAL CO·Filed 1999·Granted May 1, 2001·11 cites·11 claims
- 4252US5380805APolyimides, process for the preparation thereof and polyimide resin compositionsMITSUI TOATSU CHEMICALS·Filed 1993·Granted Jan 10, 1995·7 cites·6 claims
- 4351US6379759B2Sealing agent for liquid crystal display and liquid crystal display using the sealing agentRICOH KK·Filed 1998·Granted Apr 30, 2002·18 cites·5 claims
- 4451US4504136AMagnetic developing device with offset magnetic poleCANON KK·Filed 1983·Granted Mar 12, 1985·7 cites·3 claims
- 4550USD342500STelevision receiverMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1992·Granted Dec 21, 1993·6 cites·1 claims
- 4649USD316407STelevision receiverMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1989·Granted Apr 23, 1991·5 cites·1 claims
- 4748US5098627AMethod for producing a paper-releasing guide-claw of copying machineNTN RULON IND COMPANY LTD·Filed 1990·Granted Mar 24, 1992·9 cites·2 claims
- 4848US4606990AMethod for forming a thin layer of developerCANON KK·Filed 1985·Granted Aug 19, 1986·6 cites·8 claims
- 4947US5126802AElectric deviceRICOH KK·Filed 1990·Granted Jun 30, 1992·9 cites·13 claims
- 5046USD625752SEyeglassesPANASONIC CORP·Filed 2010·Granted Oct 19, 2010·6 cites·1 claims
Showing the top 50 of 60 patent records by PatentIndex Score.
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