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Katsuhisa Tsuji
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Kanagawa, JP
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last 30 patents
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Patent Grant
Image forming apparatus
Patent number
6,185,007
Issue date
Feb 6, 2001
Ricoh Company, Ltd.
Koji Hayashi
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Halftone image recording apparatus combining error scattering and m...
Patent number
5,077,615
Issue date
Dec 31, 1991
Ricoh Company, Ltd.
Katsuhisa Tsuji
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Method of processing colored image in multilevel gradations
Patent number
5,057,914
Issue date
Oct 15, 1991
Ricoh Company, Ltd.
Katsuhisa Tsuji
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Color image processing device
Patent number
4,953,013
Issue date
Aug 28, 1990
Ricoh Company, Ltd.
Katsuhisa Tsuji
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Digital image processing device for intermediate tone
Patent number
4,742,400
Issue date
May 3, 1988
Ricoh Corporation
Katsuhisa Tsuji
H04 - ELECTRIC COMMUNICATION TECHNIQUE