Toshiaki Serikawa

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Zushi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Writing instrument with ink quantity of level detecting function
- Patent number 4,889,442
- Issue date Dec 26, 1989
- Mitsubishi Pencil Co., Ltd.
- Hiroshi Takagi
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
Information Patent Grant
Method of manufacturing the writing tip of a ball point pen
- Patent number 4,722,124
- Issue date Feb 2, 1988
- Mitsubishi Pencil Co., Ltd.
- Toshiaki Serikawa
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES