Takafumi Tohyama

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Osaka, JP

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Patents Grantslast 30 patents

Information Patent Grant
Diphenylsulfone derivatives and heat sensitive recording materials
- Patent number 5,380,887
- Issue date Jan 10, 1995
- Nippon Soda Co., Ltd.
- Takafumi Tohyama
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Diphenylsulfone derivatives and heat sensitive recording materials
- Patent number 5,340,788
- Issue date Aug 23, 1994
- Nippon Soda Co., Ltd.
- Takafumi Tohyama
- C07 - ORGANIC CHEMISTRY