Inventor · disambiguated record
Masataka Kawahara
Also filed as: KAWAHARA MASATAKA
53 granted patents·16 pending applications·825 citations·filing 1997–2020
98Inventor score
Top patents by PatentIndex Score
69 records- 0198US11249407B2Electrophotographic photosensitive member, process cartridge and electrophotographic apparatusCANON KK·Filed 2020·Granted Feb 15, 2022·12 cites·6 claims
- 0298US11237493B2Electrophotographic photosensitive member, process cartridge and electrophotographic apparatusCANON KK·Filed 2020·Granted Feb 1, 2022·12 cites·20 claims
- 0398US11181837B2Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusCANON KK·Filed 2020·Granted Nov 23, 2021·12 cites·7 claims
- 0498US11126097B2Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusCANON KK·Filed 2020·Granted Sep 21, 2021·12 cites·7 claims
- 0598US9869032B2Manufacturing method of phthalocyanine crystal by milling crystal transformation for at least 1,000 hoursCANON KK·Filed 2016·Granted Jan 16, 2018·32 cites·2 claims
- 0698US9645516B2Electrophotographic photosensitive member, process cartridge and electrophotographic apparatusCANON KK·Filed 2015·Granted May 9, 2017·36 cites·12 claims
- 0798US9563139B2Electrophotographic photosensitive member, process cartridge and electrophotographic apparatusCANON KK·Filed 2015·Granted Feb 7, 2017·36 cites·11 claims
- 0898US9535347B2Electrophotographic photosensitive member, process cartridge and electrophotographic apparatusCANON KK·Filed 2014·Granted Jan 3, 2017·23 cites·10 claims
- 0998US9068083B2Method of producing gallium phthalocyanine crystal and method of producing electrophotographic photosensitive member using the method of producing gallium phthalocyanine crystalCANON KK·Filed 2012·Granted Jun 30, 2015·28 cites·12 claims
- 1098US8974991B2Electrophotographic photosensitive member, method of producing phthalocyanine crystal, method of producing electrophotographic photosensitive member, process cartridge, electrophotographic apparatus, and phthalocyanine crystalCANON KK·Filed 2012·Granted Mar 10, 2015·31 cites·5 claims
- 1198US8841052B2Electrophotographic photosensitive member, process cartridge and electrophotographic apparatusCANON KK·Filed 2012·Granted Sep 23, 2014·32 cites·9 claims
- 1298US8088541B2Polyvinyl acetal resin, electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusTANAKA MASATO·Filed 2006·Granted Jan 3, 2012·52 cites·7 claims
- 1398US7629102B2Method for preparing electrophotographic photosensitive memberCANON KK·Filed 2008·Granted Dec 8, 2009·38 cites·10 claims
- 1497US9645515B2Electrophotographic photosensitive member and manufacturing method thereof, process cartridge and electrophotographic apparatus, and phthalocyanine crystal and manufacturing method thereofCANON KK·Filed 2015·Granted May 9, 2017·31 cites·18 claims
- 1597US9541850B2Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusCANON KK·Filed 2015·Granted Jan 10, 2017·19 cites·10 claims
- 1697US9459545B2Electrophotographic photosensitive member, manufacturing method of electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and a solid solution and manufacturing method of a solid solutionCANON KK·Filed 2015·Granted Oct 4, 2016·22 cites·17 claims
- 1797US9459542B2Electrophotographic photosensitive member, process cartridge, electrophotographic apparatus, and gallium phthalocyanine crystalCANON KK·Filed 2012·Granted Oct 4, 2016·24 cites·9 claims
- 1897US9436106B2Electrophotographic photosensitive member and manufacturing method therefor, process cartridge and electrophotographic apparatus including the electrophotographic photosensitive member, and phthalocyanine crystal and method producing thereforCANON KK·Filed 2015·Granted Sep 6, 2016·33 cites·13 claims
- 1997US7749667B2Image forming method, and electrophotographic apparatus making use of the image forming methodCANON KK·Filed 2007·Granted Jul 6, 2010·32 cites·13 claims
- 2097US7718331B2Electrophotographic photosensitive member with depressed portions, process cartridge holding the electrophotographic photosensitive member and electrophotographic apparatus with the electrophotographic photosensitive memberCANON KK·Filed 2007·Granted May 18, 2010·41 cites·8 claims
- 2197US7622238B2Process for producing electrophotographic photosensitive memberCANON KK·Filed 2007·Granted Nov 24, 2009·36 cites·6 claims
- 2297US7551878B2Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusCANON KK·Filed 2007·Granted Jun 23, 2009·39 cites·7 claims
- 2397US7333752B2Electrophotographic photosensitive member, and process cartridge and electrophotographic apparatus which have the electrophotographic photosensitive memberCANON KK·Filed 2006·Granted Feb 19, 2008·42 cites·7 claims
- 2495US7556901B2Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusCANON KK·Filed 2007·Granted Jul 7, 2009·24 cites·9 claims
- 2589US9709907B2Electrophotographic photosensitive member, process cartridge and electrophotographic apparatusCANON KK·Filed 2015·Granted Jul 18, 2017·4 cites·11 claims
- 2686US9753385B2Electrophotographic photosensitive member, method for manufacturing electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusCANON KK·Filed 2016·Granted Sep 5, 2017·3 cites·8 claims
- 2784US9720337B2Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and chlorogallium phthalocyanine crystal and method for producing the sameCANON KK·Filed 2015·Granted Aug 1, 2017·2 cites·9 claims
- 2883US7097950B2Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusCANON KK·Filed 2005·Granted Aug 29, 2006·6 cites·11 claims
- 2983US6258498B1Electrophotographic photosensitive member, and process cartridge and electrophotographic photosensitive memberCANON KK·Filed 1999·Granted Jul 10, 2001·32 cites·8 claims
- 3082US9746790B2Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and chlorogallium phthalocyanine crystal and method for producing the sameCANON KK·Filed 2015·Granted Aug 29, 2017·2 cites·5 claims
- 3181US9864284B2Electrophotographic photosensitive member, method for manufacturing electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusCANON KK·Filed 2016·Granted Jan 9, 2018·2 cites·7 claims
- 3281US9040218B2Solution of gallium phthalocyanine method for preparing the same method for producing gallium phthalocyanine crystal method for purifying composition containing gallium phthalocyanine and method for producing electrophotographic photosensitive memberCANON KK·Filed 2014·Granted May 26, 2015·2 cites·4 claims
- 3376US9921499B2Electrophotographic photosensitive member, process cartridge, electrophotographic apparatus, and phthalocyanine pigmentCANON KK·Filed 2016·Granted Mar 20, 2018·1 cites·8 claims
- 3475US6623899B2Electrophotographic photosensitive member, process for production thereof, process cartridge and electrophotographic apparatusCANON KK·Filed 2001·Granted Sep 23, 2003·14 cites·13 claims
- 3574US5910386AElectrophotographic photosensitive member, and electrophotographic apparatus and process cartridge employing the sameCANON KK·Filed 1997·Granted Jun 8, 1999·23 cites·9 claims
- 3673US10401746B2Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusCANON KK·Filed 2018·Granted Sep 3, 2019·1 cites·7 claims
- 3773US9519232B2Electrophotographic photosensitive member, method for producing electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and hydroxygallium phthalocyanine crystalCANON KK·Filed 2015·Granted Dec 13, 2016·1 cites·13 claims
- 3869US6296978B1Electrophotographic photosensitive member, a process-cartridge inclusive thereof, and an image forming apparatusCANON KK·Filed 1998·Granted Oct 2, 2001·19 cites·12 claims
- 3967US8993204B2Electrophotographic photosensitive member, method for producing the same, process cartridge, and electrophotographic apparatusNONAKA MASAKI·Filed 2010·Granted Mar 31, 2015·1 cites·12 claims
- 4064US10012915B2Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and chlorogallium phthalocyanine crystal and method for producing the sameCANON KK·Filed 2017·Granted Jul 3, 2018·0 cites·6 claims
- 4164US6551752B2Electrophotographic photosensitive member, process cartridge and electrophotographic apparatusCANON KK·Filed 2001·Granted Apr 22, 2003·8 cites·8 claims
- 4261US9341965B2Electrophotographic photosensitive member, method for manufacturing the same, electrophotographic apparatus, process cartridge, and hydroxygallium phthalocyanine crystalCANON KK·Filed 2014·Granted May 17, 2016·0 cites·15 claims
- 4360US7160659B2Electrophotographic apparatus and process cartridgeCANON KK·Filed 2005·Granted Jan 9, 2007·2 cites·7 claims
- 4459US9298115B2Electrophotographic photosensitive member, method for manufacturing electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusCANON KK·Filed 2014·Granted Mar 29, 2016·0 cites·12 claims
- 4558US7452644B2Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusCANON KK·Filed 2006·Granted Nov 18, 2008·1 cites·10 claims
- 4655US9535345B2Solution of gallium phthalocyanine method for preparing the same method for producing gallium phthalocyanine crystal method for purifying composition containing gallium phthalocyanine and method for producing electrophotographic photosensitive memberCANON KK·Filed 2015·Granted Jan 3, 2017·0 cites·9 claims
- 4755US9086640B2Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusCANON KK·Filed 2013·Granted Jul 21, 2015·0 cites·17 claims
- 4855US2016124325A1Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and chlorogallium phthalocyanine crystal and method for producing the sameCANON KK·Filed 2015·Application pending·0 cites
- 4954US2015346616A1Electrophotographic photosensitive member, manufacturing method of electrophotographic photosensitive member, process cartridge and electrophotographic apparatus, and phthalocyanine crystal and manufacturing method of phthalocyanine crystalCANON KK·Filed 2015·Application pending·0 cites
- 5053US9104098B2Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatusCANON KK·Filed 2013·Granted Aug 11, 2015·0 cites·12 claims
Showing the top 50 of 69 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →