Kayoko Yokoyama

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Numazu, JP

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Patents Grantslast 30 patents

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Electrophotographic photoconductor having overcoat layer
- Patent number 4,970,131
- Issue date Nov 13, 1990
- Ricoh Company, Ltd.
- Kiyoshi Taniguchi
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrophotographic photoconductor with undercoat layer containing...
- Patent number 4,906,545
- Issue date Mar 6, 1990
- Ricoh Company, Ltd.
- Toshio Fukagai
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrophotographic photoconductor comprising charge generating and...
- Patent number 4,863,822
- Issue date Sep 5, 1989
- Ricoh Company Ltd.
- Toshio Fukagai
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrophotographic photoconductor with layer preventing charge inj...
- Patent number 4,822,705
- Issue date Apr 18, 1989
- Ricoh Company, Ltd.
- Toshio Fukagai
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY