Kei Cheng

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Hong Kong, CN

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Patents Grantslast 30 patents

Information Patent Grant
Ring binder mechanism
- Patent number 9,511,617
- Issue date Dec 6, 2016
- World Wide Stationary Mfg. Co., Ltd.
- Kei Cheng
- B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER

Patents Applicationslast 30 patents

Information Patent Application
RING BINDER MECHANISM
- Publication number 20150117934
- Publication date Apr 30, 2015
- World Wide Stationery Mfg. Co., Ltd.
- Kei Cheng
- B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER