Inventor · disambiguated record
Naohiro Kumagai
Also filed as: KUMAGAI NAOHIRO
76 granted patents·11 pending applications·412 citations·filing 2003–2023
99Inventor score
Top patents by PatentIndex Score
87 records- 0197US7825166B2Flexible polyurethane foam, process for its production, and seat for automobile using the flexible polyurethane foamASAHI GLASS CO LTD·Filed 2007·Granted Nov 2, 2010·33 cites·14 claims
- 0297US7272354B2Cleaning unit and image forming apparatus having multiple cleaning bladesRICOH KK·Filed 2006·Granted Sep 18, 2007·27 cites·46 claims
- 0395US7266324B2Charging device, and process cartridge and image forming apparatus using the charging deviceRICOH KK·Filed 2006·Granted Sep 4, 2007·18 cites·15 claims
- 0492US7542712B2Lubricant applicator, and image forming apparatus and process cartridge using the lubricant applicator, and method for assembling the process cartridgeRICOH KK·Filed 2006·Granted Jun 2, 2009·15 cites·4 claims
- 0592US7493075B2Cleaning device, process cartridge and image forming apparatusRICOH KK·Filed 2007·Granted Feb 17, 2009·13 cites·15 claims
- 0692US7218877B2Charging device, and process cartridge and image forming apparatus including the charging device using the sameRICOH KK·Filed 2006·Granted May 15, 2007·12 cites·16 claims
- 0791US7062194B2Charging device, and process cartridge and image forming apparatus including the charging deviceRICOH KK·Filed 2004·Granted Jun 13, 2006·31 cites·17 claims
- 0889US7149465B2Cleaning unit, process cartridge, image forming apparatus, and tonerRICOH KK·Filed 2004·Granted Dec 12, 2006·26 cites·22 claims
- 0989US7110696B2Cleaning unit, process cartridge, and image forming apparatusRICOH KK·Filed 2003·Granted Sep 19, 2006·27 cites·47 claims
- 1088US8487015B2Flexible polyurethane foam and process for its productionSASAKI TAKAYUKI·Filed 2008·Granted Jul 16, 2013·8 cites·21 claims
- 1188US7139504B2Charging device, and process cartridge and image forming apparatus using the charging deviceRICOH KK·Filed 2004·Granted Nov 21, 2006·24 cites·15 claims
- 1287US7386257B2Imaging apparatus, and toner and process cartridge used in the imaging apparatusRICOH KK·Filed 2006·Granted Jun 10, 2008·7 cites·3 claims
- 1386US9360807B2Image forming apparatusKOGURE SEIICHI·Filed 2015·Granted Jun 7, 2016·3 cites·15 claims
- 1486US7228099B2Cleaning device for cleaning a surface of an image support bodyRICOH KK·Filed 2004·Granted Jun 5, 2007·21 cites·28 claims
- 1585US7050741B2Imaging apparatus, and toner and process cartridge used in the imaging apparatusRICOH KK·Filed 2004·Granted May 23, 2006·20 cites·16 claims
- 1684US9395658B2Image forming apparatusWADA YUUJI·Filed 2015·Granted Jul 19, 2016·2 cites·19 claims
- 1784US9068693B2Lubricant supplying device, image forming apparatus, and process cartridgeHATORI SATOSHI·Filed 2013·Granted Jun 30, 2015·3 cites·35 claims
- 1883US10185255B2Image forming apparatus and image forming method for controlling a secondary transfer bias according to recording sheet typeRICOH CO LTD·Filed 2017·Granted Jan 22, 2019·2 cites·19 claims
- 1983US9632461B2Image forming apparatus controlling transfer bias based on temperature and humiditySUGIURA KENJI·Filed 2015·Granted Apr 25, 2017·2 cites·31 claims
- 2083US9459564B2Image forming apparatusOHSUGI TATSUYA·Filed 2015·Granted Oct 4, 2016·2 cites·12 claims
- 2183US9176457B2Image forming apparatus and waste toner conveying device incorporated in sameYOSHINO KAORU·Filed 2013·Granted Nov 3, 2015·5 cites·18 claims
- 2282US9835987B2Image forming apparatus and transfer bias controlSUGIURA KENJI·Filed 2016·Granted Dec 5, 2017·2 cites·13 claims
- 2382US9740156B2Image forming apparatus that adjusts a transfer bias according to surface properties of a transfer targetWADA YUUJI·Filed 2016·Granted Aug 22, 2017·2 cites·18 claims
- 2482US9081347B2Lubricant supplying device, image forming apparatus, and process cartridgeFUJIMORI AKIRA·Filed 2013·Granted Jul 14, 2015·3 cites·20 claims
- 2582US8642668B2Polymer-dispersed polyol and process for producing flexible polyurethane foamSASAKI TAKAYUKI·Filed 2009·Granted Feb 4, 2014·4 cites·16 claims
- 2681US9817341B2Image forming apparatusOHSUGI TATSUYA·Filed 2016·Granted Nov 14, 2017·2 cites·20 claims
- 2781US9645530B2Image forming apparatusKOCHI NAOTO·Filed 2016·Granted May 9, 2017·2 cites·10 claims
- 2881US9248638B2Cleaning device and image forming apparatus incorporating sameYOGOSAWA KAZUKI·Filed 2015·Granted Feb 2, 2016·2 cites·8 claims
- 2981US7831189B2Lubricant applying unit, a process cartridge including the same, and an image forming apparatus provided with the process cartridge including the sameRICOH KK·Filed 2007·Granted Nov 9, 2010·6 cites·20 claims
- 3079US10955771B2Belt control device and image forming apparatus incorporating sameKUMAGAI NAOHIRO·Filed 2020·Granted Mar 23, 2021·1 cites·7 claims
- 3178US8357730B2Process for producing flexible polyurethane foamASAHI GLASS CO LTD·Filed 2009·Granted Jan 22, 2013·3 cites·18 claims
- 3278US8204400B2Charging device capable of efficiently charging image carrierKARASAWA SHINYA·Filed 2009·Granted Jun 19, 2012·5 cites·18 claims
- 3377US10152001B2Image forming apparatusKUMAGAI NAOHIRO·Filed 2017·Granted Dec 11, 2018·1 cites·18 claims
- 3475US8909122B2Lubricant supplying device, image forming apparatus, and process cartridgeGOTOH RYOHTA·Filed 2013·Granted Dec 9, 2014·2 cites·11 claims
- 3575US7295796B1Image forming apparatus having a temporary toner holding device and a toner collecting deviceRICOH KK·Filed 2003·Granted Nov 13, 2007·14 cites·37 claims
- 3674US8190041B2Image forming apparatusKUMAGAI NAOHIRO·Filed 2008·Granted May 29, 2012·4 cites·8 claims
- 3773US8452199B2Waste toner collector, image forming apparatus, and waste toner collection containerKUMAGAI NAOHIRO·Filed 2009·Granted May 28, 2013·4 cites·9 claims
- 3873US7085528B2Cleaning unit, process cartridge, and image forming apparatusRICOH KK·Filed 2003·Granted Aug 1, 2006·12 cites·34 claims
- 3972US7430377B2Image forming apparatus and process cartridge having a detachable unit body having a lubricant applying unit and image carrier mounted thereonRICOH KK·Filed 2004·Granted Sep 30, 2008·12 cites·26 claims
- 4070US9128452B2Lubricant supply system, image forming apparatus, and process cartridgeHATORI SATOSHI·Filed 2014·Granted Sep 8, 2015·1 cites·20 claims
- 4170US9052669B2Lubricant applicator, image forming apparatus, and process cartridgeTOMITA DAISUKE·Filed 2013·Granted Jun 9, 2015·1 cites·20 claims
- 4270US7065316B2Cleaning unit, process cartridge, image forming apparatus, and tonerRICOH KK·Filed 2003·Granted Jun 20, 2006·10 cites·42 claims
- 4369US9423724B2Pressing device, in an image forming apparatus that includes an adjuster connected to two lateral platesICHIKAWA JUNICHI·Filed 2015·Granted Aug 23, 2016·1 cites·16 claims
- 4469US9256167B2Image forming apparatusNAGATA ATSUSHI·Filed 2014·Granted Feb 9, 2016·1 cites·18 claims
- 4568US9383691B2Image forming apparatus including a transfer bias controllerWADA YUUJI·Filed 2015·Granted Jul 5, 2016·1 cites·8 claims
- 4668US9063500B2Lubricant applicator, image forming apparatus, and process cartridgeGOTOH RYOHTA·Filed 2013·Granted Jun 23, 2015·1 cites·12 claims
- 4767US9213271B2Cleaner, and image forming apparatus using the cleanerWADA YUUJI·Filed 2014·Granted Dec 15, 2015·1 cites·12 claims
- 4867US8855507B2Lubricant supplying device, and image forming apparatusSEKI HIDEYASU·Filed 2013·Granted Oct 7, 2014·1 cites·19 claims
- 4965US7130564B2Method and apparatus for image forming capable of removing residual toner without using a toner cleaning system, process cartridge for use in the apparatus and toner used for the image formingRICOH KK·Filed 2004·Granted Oct 31, 2006·8 cites·50 claims
- 5062US11175610B2Image forming apparatusKUMAGAI NAOHIRO·Filed 2021·Granted Nov 16, 2021·0 cites·9 claims
Showing the top 50 of 87 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →