Sumio Manaka

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Fluoran compound and coloring recording material using it
- Patent number 5,017,710
- Issue date May 21, 1991
- Nippon Soda Co., Ltd.
- Tetsuo Igaki
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Fluoran compound and color forming record materials using the same
- Patent number 4,668,967
- Issue date May 26, 1987
- Shin Nisso Kako Co., Ltd.
- Masakichi Yahagi
- C07 - ORGANIC CHEMISTRY