Inventor · disambiguated record
Kiyofumi Nagai
Also filed as: NAGAI KIYOFUMI
82 granted patents·7 pending applications·2,629 citations·filing 1986–2018
99Inventor score
Top patents by PatentIndex Score
89 records- 0199US5431720AAqueous ink composition and ink-jet printing method using the sameRICOH KK·Filed 1993·Granted Jul 11, 1995·220 cites·18 claims
- 0298US8304043B2Inkjet recording ink and recording media set, inkjet recording method, recorded matter and recording apparatusNAGASHIMA HIDEFUMI·Filed 2008·Granted Nov 6, 2012·45 cites·15 claims
- 0398US8242201B2Pigment dispersion, recording ink, ink cartridge, ink-jet recording method and ink-jet recording apparatusGOTO HIROSHI·Filed 2006·Granted Aug 14, 2012·47 cites·19 claims
- 0498US7810919B2Recording ink, ink cartridge, ink record, inkjet recording apparatus, and inkjet recording methodRICOH KK·Filed 2005·Granted Oct 12, 2010·34 cites·15 claims
- 0598US7284851B2Inkjet recording ink, recording process and recording apparatusRICOH KK·Filed 2005·Granted Oct 23, 2007·39 cites·16 claims
- 0698US4647310AAqueous ink composition for ink jet-recordingRICOH KK·Filed 1986·Granted Mar 3, 1987·86 cites·9 claims
- 0797US7892340B2Ink-jet recording ink, ink-jet recording ink set, ink-jet recording ink media set, ink cartridge, ink-jet recording method and ink-jet recording apparatusRICOH CO LTD·Filed 2008·Granted Feb 22, 2011·29 cites·5 claims
- 0897US6695443B2Ink for ink jet recording, ink set for ink jet recording, method for ink jet recording, ink cartridge for ink jet recording, ink jet recording apparatus and recorded articleRICOH KK·Filed 2002·Granted Feb 24, 2004·76 cites·43 claims
- 0997US6613136B1Recording ink composition and ink-jet printing method using the sameRICOH KK·Filed 2000·Granted Sep 2, 2003·72 cites·15 claims
- 1097US5993524AImage recording method, image recording apparatus and image recording acceleration liquidRICOH KK·Filed 1998·Granted Nov 30, 1999·107 cites·21 claims
- 1197US5879439ARecording ink composition and recording method using the sameRICOH KK·Filed 1997·Granted Mar 9, 1999·122 cites·55 claims
- 1296US8044114B2Ink for recording, and ink cartridge, ink recorded matter, inkjet recording apparatus and inkjet recording method using the sameRICOH CO LTD·Filed 2006·Granted Oct 25, 2011·21 cites·13 claims
- 1396US7699457B2Recording ink, ink cartridge, ink record, inkjet recording apparatus, and inkjet recording methodRICOH KK·Filed 2005·Granted Apr 20, 2010·28 cites·24 claims
- 1496US7682011B2Recording ink, ink cartridge, ink record, inkjet recording apparatus and inkjet recording processRICOH KK·Filed 2005·Granted Mar 23, 2010·28 cites·15 claims
- 1596US6231652B1Aqueous ink compositions and ink-jet printing method using the sameRICOH KK·Filed 1999·Granted May 15, 2001·89 cites·10 claims
- 1696US4711668AAqueous ink compositionRICOH KK·Filed 1986·Granted Dec 8, 1987·93 cites·8 claims
- 1795US9028600B2Inkjet ink, inkjet recording method, and inkjet recording deviceGOTO HIROSHI·Filed 2012·Granted May 12, 2015·10 cites·10 claims
- 1895US8857962B2Image forming method and image formed recordGOTO HIROSHI·Filed 2009·Granted Oct 14, 2014·17 cites·11 claims
- 1995US8746869B2Ink for inkjet recording, inkjet recording method using the same, ink cartridge housing the same, and recorded matterMATSUYAMA AKIHIKO·Filed 2010·Granted Jun 10, 2014·11 cites·21 claims
- 2095US8109622B2Recording ink, ink cartridge, inkjet recording method, and inkjet recording apparatusGOTO HIROSHI·Filed 2007·Granted Feb 7, 2012·17 cites·11 claims
- 2195US8029122B2Recording ink, inkjet recording method and inkjet recording apparatusRICOH CO LTD·Filed 2007·Granted Oct 4, 2011·18 cites·18 claims
- 2295US5972082AAqueous ink composition and ink-jet printing method using the sameRICOH KK·Filed 1997·Granted Oct 26, 1999·93 cites·5 claims
- 2395US5882390ARecording ink composition and recording method using the sameRICOH KK·Filed 1997·Granted Mar 16, 1999·108 cites·12 claims
- 2494US9085706B2Inkjet ink, ink cartridge, inkjet recording method, inkjet recording device, and inkjet recorded matterGOTO HIROSHI·Filed 2011·Granted Jul 21, 2015·7 cites·18 claims
- 2594US7950793B2Recording ink, ink cartridge, ink record, inkjet recording apparatus and inkjet recording processRICOH CO LTD·Filed 2005·Granted May 31, 2011·16 cites·25 claims
- 2694US7812068B2Recording ink, inkjet recording method and inkjet recording apparatus using the sameRICOH KK·Filed 2005·Granted Oct 12, 2010·17 cites·15 claims
- 2794US7033013B2Pretreatment liquid for recording material and image recording method using the pretreatment liquidRICOH KK·Filed 2004·Granted Apr 25, 2006·36 cites·17 claims
- 2894US6786588B2Pretreatment liquid for recording material and image recording method using the pretreatment liquidRICOH KK·Filed 2002·Granted Sep 7, 2004·58 cites·15 claims
- 2994US6730149B2Ink composition and inkjet recording method and apparatus using the ink compositionRICOH KK·Filed 2002·Granted May 4, 2004·39 cites·20 claims
- 3094US5622550AYellow ink composition for ink-jet printing and image recording method using the sameRICOH KK·Filed 1996·Granted Apr 22, 1997·83 cites·31 claims
- 3193US9062217B2Liquid composition, recording method, and recorded matterGOTO HIROSHI·Filed 2011·Granted Jun 23, 2015·11 cites·18 claims
- 3292US8328343B2Recording ink as well as ink media set, ink cartridge, ink recorded matter, inkjet recording apparatus and inkjet recording methodARUGA TAMOTSU·Filed 2010·Granted Dec 11, 2012·7 cites·6 claims
- 3392US8252207B2Ink for inkjet recording, ink set for inkjet recording, ink media set for inkjet recording, ink cartridge, inkjet recording method, and inkjet recording apparatusNAMBA MICHIHIKO·Filed 2007·Granted Aug 28, 2012·10 cites·20 claims
- 3492US7938527B2Ink, ink cartridge, ink jet recording apparatus, and ink jet recording methodRICOH CO LTD·Filed 2007·Granted May 10, 2011·15 cites·13 claims
- 3592US7370952B2Ink, and, inkjet recording process, ink cartridge, recording unit, and inkjet recording apparatus using the inkRICOH KK·Filed 2002·Granted May 13, 2008·37 cites·8 claims
- 3692US6120589ASet of color ink compositions for ink-jet printing and method of forming color images using the color ink setRICOH KK·Filed 1999·Granted Sep 19, 2000·74 cites·32 claims
- 3792US5810915AAqueous ink composition and image formation method using the sameRICOH KK·Filed 1997·Granted Sep 22, 1998·71 cites·31 claims
- 3892US5514208AAqueous ink and method for recording image with the aqueous inkRICOH KK·Filed 1994·Granted May 7, 1996·76 cites·9 claims
- 3991US9163160B2Aqueous ink for inkjet, ink cartridge, and inkjet recording deviceRICOH CO LTD·Filed 2014·Granted Oct 20, 2015·5 cites·6 claims
- 4091US9034091B2Inkjet recording ink set, inkjet recording method, and recorded matterMATSUYAMA AKIHIKO·Filed 2011·Granted May 19, 2015·6 cites·20 claims
- 4191US7374608B2Ink for ink jet recording, ink jet recording method, ink cartridge and ink jet recording apparatusRICOH KK·Filed 2005·Granted May 20, 2008·9 cites·22 claims
- 4291US7094813B2Ink-jet recording ink, ink-jet recording ink set, ink cartridge, ink-jet printer, and ink-jet printing methodRICOH KK·Filed 2004·Granted Aug 22, 2006·35 cites·51 claims
- 4391US6730155B2Aqueous ink compositionRICOH KK·Filed 2001·Granted May 4, 2004·38 cites·15 claims
- 4491US4793860AAqueous ink compositionRICOH KK·Filed 1987·Granted Dec 27, 1988·59 cites·5 claims
- 4590US8435339B2Ink set, ink cartridge, inkjet recording method, and inkjet recording apparatusKOYANO MASAYUKI·Filed 2008·Granted May 7, 2013·15 cites·18 claims
- 4690US8110257B2Ink-jet recording method, ink-jet recording apparatus and recorded matterNAGASHIMA HIDEFUMI·Filed 2008·Granted Feb 7, 2012·9 cites·20 claims
- 4790US7278726B2Ink jet recording ink setRICOH KK·Filed 2002·Granted Oct 9, 2007·31 cites·15 claims
- 4890US5462592AAqueous ink compositionRICOH KK·Filed 1993·Granted Oct 31, 1995·59 cites·10 claims
- 4989US8980408B2Liquid composition, recording method, and recorded matterGOTO HIROSHI·Filed 2011·Granted Mar 17, 2015·5 cites·18 claims
- 5089US6918662B2Ink composition and inkjet recording method and apparatus using the ink compositionRICOH KK·Filed 2004·Granted Jul 19, 2005·26 cites·26 claims
Showing the top 50 of 89 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →