Inventor · disambiguated record
Toru Oguma
Also filed as: OGUMA TORU
82 granted patents·6 pending applications·2,479 citations·filing 1993–2025
99Inventor score
Top patents by PatentIndex Score
88 records- 0199US11500324B2Cartridge and electrophotographic image forming apparatusCANON KK·Filed 2021·Granted Nov 15, 2022·5 cites·42 claims
- 0298US11099518B2Cartridge and electrophotographic image forming apparatusCANON KK·Filed 2020·Granted Aug 24, 2021·5 cites·53 claims
- 0398US10551790B2Cartridge and electrophotographic image forming apparatusCANON KK·Filed 2019·Granted Feb 4, 2020·16 cites·20 claims
- 0498US10197967B2Cartridge and electrophotographic image forming apparatusCANON KK·Filed 2017·Granted Feb 5, 2019·14 cites·14 claims
- 0598US9778613B2Cartridge and electrophotographic image forming apparatusCANON KK·Filed 2016·Granted Oct 3, 2017·22 cites·14 claims
- 0698US9772598B2Cartridge and electrophotographic image forming apparatusCANON KK·Filed 2013·Granted Sep 26, 2017·21 cites·1 claims
- 0798US7315706B2Process cartridge and electrophotographic image forming apparatusCANON KK·Filed 2006·Granted Jan 1, 2008·33 cites·18 claims
- 0898US7162176B2Process cartridge and electrophotographic image forming apparatusCANON KK·Filed 2005·Granted Jan 9, 2007·41 cites·16 claims
- 0998US7024131B2Process cartridge assembling method, process cartridge remanufacturing method, and connecting memberCANON KK·Filed 2003·Granted Apr 4, 2006·121 cites·19 claims
- 1098US6272299B1Process cartridge and electrophotographic image forming apparatusCANON KK·Filed 1997·Granted Aug 7, 2001·190 cites·38 claims
- 1198US6097909APhotosensitive drum mounting method, process cartridge and electrophotographic image forming apparatusCANON KK·Filed 1997·Granted Aug 1, 2000·150 cites·43 claims
- 1298US5768658AElectrode member, developing apparatus, process cartridge and image forming apparatusCANON KK·Filed 1996·Granted Jun 16, 1998·195 cites·36 claims
- 1397US10969730B2Image forming apparatus and image forming unitCANON KK·Filed 2020·Granted Apr 6, 2021·9 cites·15 claims
- 1497US6993264B2Process cartridge and electrophotographic image forming apparatusCANON KK·Filed 2003·Granted Jan 31, 2006·76 cites·30 claims
- 1597US5790923ADeveloping apparatusCANON KK·Filed 1997·Granted Aug 4, 1998·120 cites·8 claims
- 1696US11360416B2Image forming apparatusCANON KK·Filed 2020·Granted Jun 14, 2022·4 cites·17 claims
- 1796US8571445B2Cartridge and electrophotographic image forming apparatusKOMATSU NORIYUKI·Filed 2010·Granted Oct 29, 2013·44 cites·20 claims
- 1896US7865115B2Process cartridge, electrophotographic image forming apparatus, method of manufacturing a process cartridge, and method of remanufacturing a process cartridgeCANON KK·Filed 2006·Granted Jan 4, 2011·29 cites·11 claims
- 1996US7062192B2Electrophotographic image forming apparatus, process cartridge and discharge preventing mechanismCANON KK·Filed 2004·Granted Jun 13, 2006·68 cites·15 claims
- 2096US6735405B2Method of remanufacturing process cartridge and developing deviceCANON KK·Filed 2002·Granted May 11, 2004·76 cites·30 claims
- 2196US6266500B1Developing apparatus and process cartridgeCANON KK·Filed 1998·Granted Jul 24, 2001·98 cites·32 claims
- 2295US8942592B2Process cartridge, photosensitive drum unit, developing unit and electrophotographic image forming apparatusURATANI SHUNSUKE·Filed 2010·Granted Jan 27, 2015·21 cites·16 claims
- 2395US7296341B2Disassembling tool for process cartridgeCANON KK·Filed 2005·Granted Nov 20, 2007·39 cites·4 claims
- 2495US6377759B1Process cartridge, electrophotographic image forming apparatus and developer amount detecting memberCANON KK·Filed 2000·Granted Apr 23, 2002·62 cites·63 claims
- 2595US5455665ACleaning apparatus with a member to prevent peeling of a guide member, and a process cartridge and image forming apparatus using the sameCANON KK·Filed 1993·Granted Oct 3, 1995·79 cites·62 claims
- 2695US2025390058A1Electrophotographic image forming apparatusCANON KK·Filed 2025·Application pending·0 cites
- 2794US6868243B2Image forming apparatus having process cartridge with connection arrangement for side frame bodiesCANON KK·Filed 2002·Granted Mar 15, 2005·52 cites·22 claims
- 2894US6832057B2Developing device, process cartridge, and electrophotographic image forming apparatusCANON KK·Filed 2003·Granted Dec 14, 2004·56 cites·21 claims
- 2994US5812909ADeveloping deviceCANON KK·Filed 1997·Granted Sep 22, 1998·71 cites·10 claims
- 3093US6952544B2Method of reproducing process cartridge or developing apparatusCANON KK·Filed 2003·Granted Oct 4, 2005·45 cites·20 claims
- 3193US6804475B2Process cartridge comprising grounding, charging bias, and developing bias contacts and input and output contacts, and electrophotographic image forming apparatus to which the process cartridge is detachably mountableCANON KK·Filed 2002·Granted Oct 12, 2004·51 cites·19 claims
- 3291US7239823B2Electrophotographic image forming apparatus, process cartridge and discharge preventing mechanismCANON KK·Filed 2006·Granted Jul 3, 2007·21 cites·15 claims
- 3391US7073251B2Disassembling tool for process cartridgeCANON KK·Filed 2003·Granted Jul 11, 2006·42 cites·11 claims
- 3491US6571070B2Process cartridge and image forming apparatusCANON KK·Filed 2001·Granted May 27, 2003·40 cites·19 claims
- 3591US6512895B2Process cartridge and electrophotographic image forming systemCANON KK·Filed 2001·Granted Jan 28, 2003·39 cites·14 claims
- 3690USD863419SFlange coupling for process cartridge for image forming apparatusCANON KK·Filed 2018·Granted Oct 15, 2019·34 cites·1 claims
- 3789US12436492B2Cartridge and electrophotographic image forming apparatusCANON KK·Filed 2024·Granted Oct 7, 2025·0 cites·39 claims
- 3888US2025102996A1Development device, process cartridge, and image forming apparatusCANON KK·Filed 2024·Application pending·0 cites
- 3987US6671477B2Developing device, process cartridge and image forming apparatusCANON KK·Filed 2002·Granted Dec 30, 2003·28 cites·20 claims
- 4087US6606469B2Developing apparatus mounted on image forming apparatusCANON KK·Filed 2002·Granted Aug 12, 2003·27 cites·6 claims
- 4187US6594454B2Electric contact member and developing device, process cartridge, and electrophotographic image-forming apparatus using the electric contact memberCANON KK·Filed 2001·Granted Jul 15, 2003·27 cites·12 claims
- 4287US2025004417A1Development device, process cartridge, and image forming apparatusCANON KK·Filed 2024·Application pending·0 cites
- 4386US10606210B2Development device, process cartridge, and image forming apparatusCANON KK·Filed 2019·Granted Mar 31, 2020·1 cites·3 claims
- 4486US10466641B2Image forming unit to suppress uneven chargingCANON KK·Filed 2018·Granted Nov 5, 2019·2 cites·7 claims
- 4585US7095967B2Image developing apparatus, process cartridge, electrophotographic image forming apparatus, and developing unit frameCANON KK·Filed 2004·Granted Aug 22, 2006·21 cites·12 claims
- 4684US6804476B2Process cartridge and developing device detachably attachable to image forming apparatus main body and having developer seal member with grip portion, and such image forming apparatusCANON KK·Filed 2003·Granted Oct 12, 2004·24 cites·20 claims
- 4783US12117763B2Development device, process cartridge, and image forming apparatusCANON KK·Filed 2023·Granted Oct 15, 2024·0 cites·14 claims
- 4883US11994824B2Cartridge and electrophotographic image forming apparatusCANON KK·Filed 2022·Granted May 28, 2024·0 cites·20 claims
- 4983US6625413B2Developing device, process cartridge and electrophotographic image forming apparatusCANON KK·Filed 2001·Granted Sep 23, 2003·22 cites·18 claims
- 5083US6173130B1Development agent container, process cartridge, and image forming apparatusCANON KK·Filed 1999·Granted Jan 9, 2001·32 cites·10 claims
Showing the top 50 of 88 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →