Toshiyasu Kawabata

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Patents Grantslast 30 patents

Information Patent Grant
Electrophotographic positive charging toner containing a copper pht...
- Patent number 4,931,374
- Issue date Jun 5, 1990
- Ricoh Company, Ltd.
- Masami Tomita
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrophotographic toner containing triazolium compound as charge...
- Patent number 4,554,233
- Issue date Nov 19, 1985
- Ricoh Company, Ltd.
- Mitsuru Hashimoto
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrographic development process
- Patent number 4,401,740
- Issue date Aug 30, 1983
- Ricoh Company, Ltd.
- Toshiyasu Kawabata
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY