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Patents Grants
last 30 patents
Information
Patent Grant
Cleaning unit and image forming apparatus having multiple cleaning...
Patent number
7,272,354
Issue date
Sep 18, 2007
Ricoh Company, Ltd.
Eisaku Murakami
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Cleaning unit, process cartridge, and image forming apparatus
Patent number
7,110,696
Issue date
Sep 19, 2006
Ricoh Company, Ltd.
Eisaku Murakami
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Method and apparatus for image forming capable of preventing a cont...
Patent number
6,512,901
Issue date
Jan 28, 2003
Ricoh Company, Ltd.
Mugijiroh Uno
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing device for an image forming apparatus
Patent number
6,033,818
Issue date
Mar 7, 2000
Ricoh Company, Ltd.
Toshihiro Sugiyama
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developer, process cartridge and electrophotographic image forming...
Patent number
6,022,660
Issue date
Feb 8, 2000
Ricoh Company, Ltd.
Mugijiroh Uno
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Electrophotographic recording apparatus configured to switch a bias...
Patent number
5,897,243
Issue date
Apr 27, 1999
Ricoh Company, Ltd.
Satoru Komatsubara
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Method of coating a toner conveyor roller
Patent number
5,879,752
Issue date
Mar 9, 1999
Ricoh Company, Ltd.
Eisaku Murakami
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing device for an image forming apparatus
Patent number
5,845,183
Issue date
Dec 1, 1998
Ricoh Company, Ltd.
Toshihiro Sugiyama
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing device for an electrophotographic recording apparatus in...
Patent number
5,826,144
Issue date
Oct 20, 1998
Ricoh Company, Ltd.
Eiji Takenaka
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Image forming apparatus with bias control to prevent undesirable to...
Patent number
5,768,665
Issue date
Jun 16, 1998
Ricoh Company, Ltd.
Tetsuo Yamanaka
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing device for an image forming apparatus
Patent number
5,708,942
Issue date
Jan 13, 1998
Ricoh Company, Ltd.
Toshihiro Sugiyama
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing device having the lengths of two toner transporting roll...
Patent number
5,697,026
Issue date
Dec 9, 1997
Ricoh Company, Ltd.
Iwao Matsumae
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Toner, and devices for electrostatically depositing a uniform appli...
Patent number
5,625,438
Issue date
Apr 29, 1997
Ricoh Company, Ltd.
Toshihiro Sugiyama
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing device having seals between a toner transport roller and...
Patent number
5,625,440
Issue date
Apr 29, 1997
Ricoh Company, Ltd.
Iwao Matsumae
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing device for an image forming apparatus
Patent number
5,625,441
Issue date
Apr 29, 1997
Ricoh Company, Ltd.
Toshihiro Sugiyama
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing device for an image forming apparatus which reduces tone...
Patent number
5,617,190
Issue date
Apr 1, 1997
Ricoh Company, Ltd.
Eiji Takenaka
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Toner conveyor roller and image forming apparatus having the same
Patent number
5,617,191
Issue date
Apr 1, 1997
Ricoh Company, Ltd.
Eisaku Murakami
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing device for an image forming apparatus
Patent number
5,610,693
Issue date
Mar 11, 1997
Ricoh Company, Ltd.
Toshihiro Sugiyama
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing device for an image forming apparatus
Patent number
5,552,870
Issue date
Sep 3, 1996
Ricoh Company, Ltd.
Eisaku Murakami
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing device for an image forming apparatus
Patent number
5,489,747
Issue date
Feb 6, 1996
Ricoh Company, Ltd.
Eiji Takenaka
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing device for an image forming apparatus
Patent number
5,486,909
Issue date
Jan 23, 1996
Ricoh Company, Ltd.
Eiji Takenaka
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Patents Applications
last 30 patents
Information
Patent Application
Cleaning unit, process cartridge, image forming apparatus, and toner
Publication number
20060216085
Publication date
Sep 28, 2006
Eisaku Murakami
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Application
Cleaning unit, process cartridge, image forming apparatus, and toner
Publication number
20040136763
Publication date
Jul 15, 2004
Eisaku Murakami
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY