Michihisa Takahashi

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Tachikawa, JP

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Patents Grantslast 30 patents

Information Patent Grant
Initialization of phase-change optical recording medium
- Patent number RE39901
- Issue date Oct 30, 2007
- Ricoh Company, Ltd.
- Kyohji Hattori
- 369 - Dynamic information storage or retrieval
Information Patent Grant
Initialization of phase-change optical recording medium
- Patent number 6,445,669
- Issue date Sep 3, 2002
- Ricoh Company, Ltd.
- Kyohji Hattori
- G11 - INFORMATION STORAGE
Information Patent Grant
Diazo-type thermosensitive recording material with hydrazone couple...
- Patent number 4,659,644
- Issue date Apr 21, 1987
- Ricoh Company, Ltd.
- Takayuki Hoshina
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY