Inventor
UMEMURA KAZUHIKO
JP46 patents
⚠️ This page may combine multiple inventors who share the name “UMEMURA KAZUHIKO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
RICOH KK
35 patentsUS7480476B2Jan 20, 2009
Developer container, developer supplying device, and image forming apparatus
RICOH KK115 citations99
US7321744B2Jan 22, 2008
Developer container, developer supplying device, and image forming apparatus
RICOH KK111 citations99
US7697870B2Apr 13, 2010
Developer container, developer supplying device, and image forming apparatus
RICOH KK54 citations98
US7519317B2Apr 14, 2009
Developer container, developer supplying device, and image forming apparatus
RICOH KK72 citations98
US7076192B2Jul 11, 2006
Powder conveying device and image forming apparatus using the same
RICOH KK55 citations96
US6828075B2Dec 7, 2004
Carrier for electrophotography and developer using the same
RICOH KK52 citations96
US6818369B2Nov 16, 2004
Toner for electrostatic image development and image forming method and apparatus using the toner
RICOH KK58 citations96
US6493529B1Dec 10, 2002
Charging device with walls surrounding the electrodes which reduce ozone emissions
RICOH KK56 citations95
US5952048ASep 14, 1999
Ink composition and recording method using the same
RICOH KK57 citations95
US5740507AApr 14, 1998
Densely packed toner container and method of producing the same
RICOH KK57 citations95
US7398038B2Jul 8, 2008
Image forming apparatus using a toner container and a process cartridge
RICOH KK47 citations93
US7288353B2Oct 30, 2007
Toner, developer, image developer and image forming apparatus
RICOH KK18 citations93
US7258959B2Aug 21, 2007
Toner for electrophotography and image forming apparatus
RICOH KK42 citations93
US7212767B2May 1, 2007
Image forming apparatus and process cartridge removably mounted thereto
RICOH KK27 citations93
US7172844B2Feb 6, 2007
Toner for electrophotography, and image forming process, process cartridge and image forming apparatus using the same
RICOH KK36 citations93
US7169525B2Jan 30, 2007
Toner, developer, image forming apparatus, process cartridge and image forming process
RICOH KK37 citations93
US7163773B2Jan 16, 2007
Toner for developing electrostatic image, developer, process for forming image, and image forming apparatus
RICOH KK27 citations93
US7024140B2Apr 4, 2006
Toner feeder, toner, and electrophotographic image forming apparatus using the toner feeder and toner
RICOH KK36 citations93
US6447973B1Sep 10, 2002
Liquid developer for developing electrostatic image and image forming method
RICOH KK70 citations93
US7169522B2Jan 30, 2007
Toner for developing a latent electrostatic image, developer using the same, full-color toner kit using the same, image-forming apparatus using the same, image-forming process cartridge using the same and image-forming process using the same
RICOH KK42 citations92
US7136610B2Nov 14, 2006
Image forming apparatus using installable process cartridge, method of positioning process cartridge, and process cartridge itself
RICOH KK38 citations92
US7024133B2Apr 4, 2006
Image forming apparatus using a user installable process cartridge, a method of arranging the process cartridge, and the process cartridge itself
RICOH KK50 citations92
US6861191B2Mar 1, 2005
Dry toner for developing electrostatic images
RICOH KK45 citations92
US6770411B2Aug 3, 2004
Negatively chargeable toner
RICOH KK50 citations92
US5759733AJun 2, 1998
Liquid developer for electrostatic electrophotography
RICOH KK22 citations92
US5189102AFeb 23, 1993
Method for producing a vinyl resin using a silicon oil solvent
RICOH KK47 citations92
US5061587AOct 29, 1991
Toner for electrophotography including fluorine contained graft copolymer
RICOH KK44 citations92
US4950573AAug 21, 1990
Toner for developing latent electrostatic images
RICOH KK45 citations92
US5026621AJun 25, 1991
Toner for electrophotography
RICOH KK50 citations90
US7611815B2Nov 3, 2009
External additive for toner for electrophotography, toner for electrophotography, double-component developer for electrophotography, image-forming process using the toner, and image-forming apparatus using the toner
RICOH KK15 citations84
US7003255B2Feb 21, 2006
Image forming apparatus and process cartridge
RICOH KK13 citations82
US7413838B2Aug 19, 2008
External additives for electrophotographic toner, electrophotographic toner, electrophotographic developer, image forming method and image forming apparatus
RICOH KK8 citations74
US5169739ADec 8, 1992
Liquid developer for image fixing method using heat application rollers
RICOH KK10 citations73
US5328794AJul 12, 1994
Fluorine-containing graft copolymer and toner using the same
RICOH KK16 citations70
US7749674B2Jul 6, 2010
Toner, developer, image developer and image forming apparatus
RICOH KK4 citations63
RICOH CO LTD
6 patentsUS8005406B2Aug 23, 2011
Developer container, developer supplying device, and image forming apparatus
RICOH CO LTD60 citations98
US7835673B2Nov 16, 2010
Developer container, developer supplying device, and image forming apparatus
RICOH CO LTD58 citations98
US11274221B2Mar 15, 2022
Ink, ink set, ink container, image forming method, image forming apparatus and recorded matter
RICOH CO LTD2 citations70
US11186737B2Nov 30, 2021
Ink and printing method
RICOH CO LTD1 citations59
US11578220B2Feb 14, 2023
Ink, ink accommodating unit, printing device and printing method
RICOH CO LTD0 citations58
US11499062B2Nov 15, 2022
Ink, ink set, ink container, image forming method, and image forming apparatus
RICOH CO LTD0 citations52