Inventor · disambiguated record
Isao Koishi
Also filed as: KOISHI ISAO
54 granted patents·7 pending applications·1,336 citations·filing 2004–2025
99Inventor score
Top patents by PatentIndex Score
61 records- 0199US11199807B2Cartridge and drum unit for electrophotographic image forming apparatusCANON KK·Filed 2020·Granted Dec 14, 2021·12 cites·289 claims
- 0299US7890012B2Process cartridge having a drum, a developing roller, and first and second frames, and electrophotographic image forming apparatus on which such process cartridge is mountableCANON KK·Filed 2007·Granted Feb 15, 2011·60 cites·15 claims
- 0399US7813671B2Process cartridge and electrophotographic image forming apparatusCANON KK·Filed 2008·Granted Oct 12, 2010·63 cites·14 claims
- 0499US7457566B2Electrophotosensitive drum having non-circular twisted projection with electroconductive member thereon, process cartridge having such drum, and electrophotographic image forming apparatus to which the cartridge is detachably mountableCANON KK·Filed 2005·Granted Nov 25, 2008·68 cites·7 claims
- 0599US7315710B2Electrophotographic photosensitive drum supporting apparatus, process cartridge and electrophotographic image forming apparatusCANON KK·Filed 2006·Granted Jan 1, 2008·140 cites·21 claims
- 0699US7184690B2Electrophotographic photosensitive drum supporting apparatus, process cartridge and electrophotographic image forming apparatusCANON KK·Filed 2004·Granted Feb 27, 2007·182 cites·15 claims
- 0799US7139502B2Process cartridge and electrophotographic image forming apparatusCANON KK·Filed 2004·Granted Nov 21, 2006·151 cites·9 claims
- 0899US7003247B2Electrophotographic photosensitive drum, process cartridge, and electrophotographic image forming apparatusCANON KK·Filed 2004·Granted Feb 21, 2006·154 cites·2 claims
- 0998US9791825B2Cartridge and drum unit for electrophotographic image forming apparatusCANON KK·Filed 2016·Granted Oct 17, 2017·14 cites·6 claims
- 1098US8139979B2Process cartridge and electrophotographic image forming apparatusKOISHI ISAO·Filed 2010·Granted Mar 20, 2012·44 cites·10 claims
- 1198US7856192B2Process cartridge and electrophotographic image forming apparatusCANON KK·Filed 2007·Granted Dec 21, 2010·44 cites·12 claims
- 1297US12066786B2Cartridge and drum unit for electrophotographic image forming apparatusCANON KK·Filed 2023·Granted Aug 20, 2024·2 cites·39 claims
- 1397US11579561B2Cartridge and drum unit for electrophotographic image forming apparatusCANON KK·Filed 2022·Granted Feb 14, 2023·2 cites·30 claims
- 1497US11256209B2Image forming system having a movable member and first and second cartridges having a pressing portion for pressing the movable memberCANON KK·Filed 2021·Granted Feb 22, 2022·4 cites·12 claims
- 1597US11163259B2Cartridge detachably mountable to main assembly of electrophotographic image forming apparatus, assembling method for drive transmitting device for photosensitive drum, and electrophotographic image forming apparatusCANON KK·Filed 2020·Granted Nov 2, 2021·5 cites·16 claims
- 1697US10671015B2Cartridge and drum unit for electrophotographic image forming apparatusCANON KK·Filed 2018·Granted Jun 2, 2020·10 cites·1 claims
- 1797US10203652B2Cartridge and drum unit for electrophotographic image forming apparatusCANON KK·Filed 2017·Granted Feb 12, 2019·11 cites·15 claims
- 1897US9395679B2Cartridge detachably mountable to main assembly of electrophotographic image forming apparatus, assembling method for drive transmitting device for photosensitive drum, and electrophotographic image forming apparatusCANON KK·Filed 2014·Granted Jul 19, 2016·16 cites·27 claims
- 1997US8862015B2Image forming apparatus with urging member that establishes electrical connection with a cartridgeCANON KK·Filed 2013·Granted Oct 14, 2014·18 cites·13 claims
- 2097US8526841B2Process cartridge and electrophotographic image forming apparatusKOISHI ISAO·Filed 2010·Granted Sep 3, 2013·32 cites·13 claims
- 2197US7158749B2Cleaning device, process cartridge, cleaning member and electrophotographic image forming apparatusCANON KK·Filed 2004·Granted Jan 2, 2007·72 cites·10 claims
- 2296US11829096B2Cartridge, attachment and mounting kitCANON KK·Filed 2021·Granted Nov 28, 2023·2 cites·70 claims
- 2396US10427867B2Packing member and cartridge packed in the packing memberCANON KK·Filed 2017·Granted Oct 1, 2019·11 cites·18 claims
- 2496US9823619B2Cartridge detachably mountable to main assembly of electrophotographic image forming apparatus, assembling method for drive transmitting device for photosensitive drum, and electrophotographic image forming apparatusCANON KK·Filed 2016·Granted Nov 21, 2017·12 cites·27 claims
- 2595US12130579B2Cartridge and drum unit for electrophotographic image forming apparatusCANON KK·Filed 2023·Granted Oct 29, 2024·1 cites·57 claims
- 2695US11669044B2Cartridge having a portion-to-be-positioned and a pressing portion configured in relation to a corresponding apparatusCANON KK·Filed 2022·Granted Jun 6, 2023·2 cites·9 claims
- 2795US11619905B2Cartridge detachably mountable to main assembly of electrophotographic image forming apparatus, assembling method for drive transmitting device for photosensitive drum, and electrophotographic image forming apparatusCANON KK·Filed 2021·Granted Apr 4, 2023·2 cites·12 claims
- 2895US11048207B2Image forming apparatus having a movable member and cartridge having a pressing portion for pressing the movable memberCANON KK·Filed 2019·Granted Jun 29, 2021·6 cites·7 claims
- 2995US9501031B2Packaged cartridge, packing material and cartridgeCANON KK·Filed 2013·Granted Nov 22, 2016·11 cites·11 claims
- 3094US12066769B2Toner container having a shutter and an engaging portion exposed from the shutterCANON KK·Filed 2022·Granted Aug 20, 2024·2 cites·20 claims
- 3194US10635045B2Cartridge detachably mountable to main assembly of electrophotographic image forming apparatus, assembling method for drive transmitting device for photosensitive drum, and electrophotographic image forming apparatusCANON KK·Filed 2017·Granted Apr 28, 2020·5 cites·26 claims
- 3294US10353339B2Cartridge with restriction member for restricting relative movement of toner cartridge and process cartridgeCANON KK·Filed 2018·Granted Jul 16, 2019·12 cites·16 claims
- 3393US12271136B2Image forming apparatus including a display unit for displaying information about a procedure for replenishing developerCANON KK·Filed 2023·Granted Apr 8, 2025·1 cites·9 claims
- 3492US7072601B2Process cartridge, method of assembling process cartridge, and connecting memberCANON KK·Filed 2004·Granted Jul 4, 2006·42 cites·7 claims
- 3591US11796947B2Image forming apparatus including a display unit for displaying information about a procedure for replenishing developerCANON KK·Filed 2022·Granted Oct 24, 2023·1 cites·5 claims
- 3691US9708116B2Packing member and cartridge packed in the packing memberCANON KK·Filed 2013·Granted Jul 18, 2017·12 cites·50 claims
- 3790US12045005B2Cartridge assemblyCANON KK·Filed 2022·Granted Jul 23, 2024·1 cites·9 claims
- 3890US8781355B2Electrical contact, electrophotographic photosensitive drum, and process cartridgeKOISHI ISAO·Filed 2011·Granted Jul 15, 2014·6 cites·36 claims
- 3989US2025013188A1Cartridge and drum unit for electrophotographic image forming apparatusCANON KK·Filed 2024·Application pending·0 cites
- 4088US9423767B2Packing member and cartridge packed in the packing memberCANON KK·Filed 2013·Granted Aug 23, 2016·12 cites·20 claims
- 4188US2025116960A1Cartridge, attachment and mounting kitCANON KK·Filed 2024·Application pending·0 cites
- 4286US11454912B2Image forming apparatus including a display unit for displaying information about a procedure for replenishing developerCANON KK·Filed 2021·Granted Sep 27, 2022·1 cites·8 claims
- 4386US9310756B2Image forming apparatus and main assembly of the image forming apparatusCANON KK·Filed 2014·Granted Apr 12, 2016·4 cites·16 claims
- 4482USD587304SToner cartridgeCANON KK·Filed 2007·Granted Feb 24, 2009·27 cites·1 claims
- 4582US2025271798A1Image forming apparatusCANON KK·Filed 2025·Application pending·0 cites
- 4678US2022043389A1Cartridge and drum unit for electrophotographic image forming apparatusCANON KK·Filed 2021·Application pending·0 cites
- 4776US2024337966A1Toner container and image forming systemCANON KK·Filed 2024·Application pending·0 cites
- 4875USD796574SPhotosensitive drum for cartridgeCANON KK·Filed 2016·Granted Sep 5, 2017·16 cites·1 claims
- 4973USD786968SProcess cartridge for printerCANON KK·Filed 2016·Granted May 16, 2017·15 cites·1 claims
- 5072USD823380SCartridgeCANON KK·Filed 2016·Granted Jul 17, 2018·14 cites·1 claims
Showing the top 50 of 61 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →