Zhao Zhang Dai

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Shen Zhen, CN

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Patents Grantslast 30 patents

Information Patent Grant
Free ink writing instrument with nano technology
- Patent number 6,648,539
- Issue date Nov 18, 2003
- Toyo Pen International Ltd.
- Zhao Zhang Dai
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES

Patents Applicationslast 30 patents

Information Patent Application
Free ink writing instrument with nano technology
- Publication number 20020172544
- Publication date Nov 21, 2002
- Zhao Zhang Dai
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES