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Takayuki Maruta
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Tokyo, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Image forming system
Patent number
RE41934
Issue date
Nov 16, 2010
Ricoh Company, Ltd.
Takayuki Maruta
399 - Electrophotography
Information
Patent Grant
Magnetic carrier, two-component developer, development method, deve...
Patent number
7,474,867
Issue date
Jan 6, 2009
Ricoh Company, Ltd.
Takamasa Ozeki
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Tandem color image forming apparatus with an image transfer belt an...
Patent number
7,174,124
Issue date
Feb 6, 2007
Ricoh Company, Ltd.
Hitoshi Ishibashi
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing method for an image forming apparatus and developing dev...
Patent number
7,139,517
Issue date
Nov 21, 2006
Ricoh Company, Ltd.
Shigekazu Enoki
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Charging device, process cartridge and image forming apparatus
Patent number
7,139,512
Issue date
Nov 21, 2006
Ricoh Company, Ltd.
Akiyo Namiki
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Image forming apparatus with variable speed transferring and fixing...
Patent number
6,823,149
Issue date
Nov 23, 2004
Ricoh Company, Ltd.
Takahiro Yoshikawa
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Image forming system
Patent number
6,535,707
Issue date
Mar 18, 2003
Ricoh Company, Ltd.
Takayuki Maruta
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Image forming apparatus with control over developing unit during an...
Patent number
6,226,481
Issue date
May 1, 2001
Ricoh Company, Ltd.
Takuzi Yoneda
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Image forming apparatus capable of changing process line speed
Patent number
6,160,569
Issue date
Dec 12, 2000
Ricoh Company, Ltd.
Kota Fujimori
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Apparatus and method for detecting developing ability of an image f...
Patent number
6,055,386
Issue date
Apr 25, 2000
Ricoh Company, Ltd.
Shinji Kato
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Image forming apparatus and method for preventing wasted toner
Patent number
5,881,334
Issue date
Mar 9, 1999
Ricoh Company, Ltd.
Takayuki Maruta
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Apparatus and method for detecting developing ability of an image f...
Patent number
5,860,038
Issue date
Jan 12, 1999
Ricoh Company, Ltd.
Shinji Kato
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Color image forming device having a revolver developing unit
Patent number
5,835,825
Issue date
Nov 10, 1998
Ricoh Company Ltd.
Takayuki Maruta
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Color image forming device which changes developing bias when switc...
Patent number
5,826,146
Issue date
Oct 20, 1998
Ricoh Company, Ltd.
Takayuki Maruta
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Image forming device in which developer roller speed is controlled...
Patent number
5,724,634
Issue date
Mar 3, 1998
Ricoh Company, Ltd.
Takayuki Maruta
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Color image forming device which changes developing bias when switc...
Patent number
5,671,470
Issue date
Sep 23, 1997
Ricoh Company, Ltd.
Takayuki Maruta
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Image forming method and apparatus for the same
Patent number
5,424,809
Issue date
Jun 13, 1995
Ricoh Comapany, Ltd.
Noboru Sawayama
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Developing device for image forming equipment
Patent number
5,384,628
Issue date
Jan 24, 1995
Ricoh Company, Ltd.
Nobuo Takami
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Testing image density to control toner concentration and dynamic ra...
Patent number
5,298,944
Issue date
Mar 29, 1994
Ricoh Company, Ltd.
Noboru Sawayama
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Image forming apparatus for controlling the dynamic range of an image
Patent number
5,293,198
Issue date
Mar 8, 1994
Ricoh Company, Ltd.
Noboru Sawayama
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Image forming equipment having improved toner sensing
Patent number
5,270,783
Issue date
Dec 14, 1993
Ricoh Company, Ltd.
Takashi Bisaiji
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Color image forming equipment responsive to changes in ambient cond...
Patent number
5,237,369
Issue date
Aug 17, 1993
Ricoh Company, Ltd.
Takayuki Maruta
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Electrophotographic image forming apparatus which controls develope...
Patent number
5,227,842
Issue date
Jul 13, 1993
Ricoh Company, Ltd.
Kouji Hayashi
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Color image forming apparatus
Patent number
4,916,547
Issue date
Apr 10, 1990
Ricoh Company, Ltd.
Akio Katsumata
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Patents Applications
last 30 patents
Information
Patent Application
Charging device, process cartridge and image forming apparatus
Publication number
20060062598
Publication date
Mar 23, 2006
Akiyo Namiki
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Application
Magnetic carrier, two-component developer, development method, deve...
Publication number
20050281593
Publication date
Dec 22, 2005
Takamasa Ozeki
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Application
Developing method for an image forming apparatus and developing dev...
Publication number
20050271427
Publication date
Dec 8, 2005
Shigekazu Enoki
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Application
Magnetic carrier, two-component developer, development method, deve...
Publication number
20040190946
Publication date
Sep 30, 2004
Shigekazu Enoki
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Application
Tandem color image forming apparatus
Publication number
20040109709
Publication date
Jun 10, 2004
Hitoshi Ishibashi
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Application
Developing method for an image forming apparatus and developing dev...
Publication number
20030185599
Publication date
Oct 2, 2003
Shigekazu Enoki
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Application
Charging device, process cartridge and image forming apparatus
Publication number
20030175046
Publication date
Sep 18, 2003
Akiyo Namiki
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Application
Image forming apparatus
Publication number
20030161649
Publication date
Aug 28, 2003
Takahiro Yoshikawa
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Application
Image forming system
Publication number
20020051655
Publication date
May 2, 2002
Takayuki Maruta
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY