Isao Shiojima

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Mishima, JP

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Patents Grantslast 30 patents

Information Patent Grant
Leuco dyes and recording material employing the same
- Patent number 5,084,593
- Issue date Jan 28, 1992
- Ricoh Company, Ltd.
- Hiroshi Gotoh
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Leuco dyes and recording material employing the same
- Patent number 5,057,154
- Issue date Oct 15, 1991
- Ricoh Company, Ltd.
- Shigeru Kusakata
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Leuco dyes and recording material employing the same
- Patent number 5,008,238
- Issue date Apr 16, 1991
- Ricoh Company, Ltd.
- Hiroshi Gotoh
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Leuco dyes and recording material employing the same
- Patent number 4,939,117
- Issue date Jul 3, 1990
- Ricoh Company, Ltd.
- Shigeru Kusakata
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Cyanine dyes
- Patent number 4,847,385
- Issue date Jul 11, 1989
- Ricoh Company, Ltd.
- Shigeru Kusakata
- G11 - INFORMATION STORAGE