Chun Yuen To

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Hong Kong, CN

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Patents Grantslast 30 patents

Information Patent Grant
Ring mechanism having elliptical cross sectional ring members
- Patent number D783092
- Issue date Apr 4, 2017
- World Wide Stationery Mfg. Co., Ltd.
- Chun Yuen To
- D19 - Office supplies
Information Patent Grant
Elliptical cross sectional ring member for a ring mechanism
- Patent number D735808
- Issue date Aug 4, 2015
- World Wide Stationery Mfg. Co., Ltd.
- Chun Yuen To
- D19 - Office supplies