Koichi Koga

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Toyonaka, JA

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Patents Grantslast 30 patents

Information Patent Grant
Ultra violet absorber
- Patent number 4,028,331
- Issue date Jun 7, 1977
- Sumitomo Chemical Company, Limited
- Seiji Hotta
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Benz (c) fluoran compounds and recording sheet containing them
- Patent number 3,947,471
- Issue date Mar 30, 1976
- Sumitomo Chemical Company, Ltd.
- Takashi Akamatsu
- C07 - ORGANIC CHEMISTRY