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Kenji Seki
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Yokohama, JP
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last 30 patents
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Patent Grant
Electrophotographic photoconductor layered element comprising salt...
Patent number
4,871,635
Issue date
Oct 3, 1989
Ricoh Company, Ltd.
Kenji Seki
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Layered photosensitive material for electrophotography
Patent number
4,775,605
Issue date
Oct 4, 1988
Ricoh Co., Ltd.
Kenji Seki
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Electrophotographic light-sensitive member with thin overlayer
Patent number
4,469,771
Issue date
Sep 4, 1984
Ricoh Co., Ltd.
Haruo Hasegawa
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information
Patent Grant
Electrophotographic light-sensitive member
Patent number
4,225,648
Issue date
Sep 30, 1980
Ricoh Company, Ltd.
Haruo Hasegawa
G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY