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Tsutomu Kagawa
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Shizuoka-ken, JP
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last 30 patents
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Patent Grant
Reversible thermosensitive recording label and reversible thermosen...
Patent number
5,643,851
Issue date
Jul 1, 1997
Ricoh Company, Ltd.
Yukio Konagaya
G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information
Patent Grant
Method for producing reversible thermosensitive recording material
Patent number
5,556,827
Issue date
Sep 17, 1996
Ricoh Company, Ltd.
Toru Nogiwa
B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information
Patent Grant
Method for producing a reversible thermosensitive recording material
Patent number
5,380,550
Issue date
Jan 10, 1995
Ricoh Company, Ltd.
Kunitoshi Sugiyama
B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information
Patent Grant
Reversible thermosensitive recording material and method for produc...
Patent number
5,342,815
Issue date
Aug 30, 1994
Ricoh Company, Ltd.
Kunitoshi Sugiyama
B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information
Patent Grant
Method of compensating for distortion in recording layer in reversi...
Patent number
5,310,718
Issue date
May 10, 1994
Ricoh Company, Ltd.
Tetsuya Amano
B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS