Yoshito Tsumuraya

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Kanagawa, JP

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Patents Grantslast 30 patents

Information Patent Grant
Water-based ink composition and ballpoint pen using the same
- Patent number 7,473,309
- Issue date Jan 6, 2009
- Mitsubishi Pencil Co., Ltd.
- Yoshito Tsumuraya
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES

Patents Applicationslast 30 patents

Information Patent Application
Water-based ink composition and ball pen employing the same
- Publication number 20060213392
- Publication date Sep 28, 2006
- Mitsubishi Pencil Co., Ltd.
- Yoshito Tsumuraya
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES