Zhongwei Cao

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Ningbo, CN

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Patents Grantslast 30 patents

Information Patent Grant
Dual key bi-step lock
- Patent number 8,806,908
- Issue date Aug 19, 2014
- Yongyao Yu
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Grant
Door locking system with an idle handle
- Patent number 8,479,543
- Issue date Jul 9, 2013
- Zaifu Yang
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES

Patents Applicationslast 30 patents

Information Patent Application
Combination Padlock With Revolving Cover
- Publication number 20130219973
- Publication date Aug 29, 2013
- NINGBO YONGFA GROUP CO., LTD.,
- Zhongwei Cao
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Application
Door Locking System With An Idle Handle
- Publication number 20120291503
- Publication date Nov 22, 2012
- NINGBO YONGFA GROUP CO., LTD.,
- Zaifu Yang
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Application
Emergently Openable Safe Door
- Publication number 20120060726
- Publication date Mar 15, 2012
- NINGBO YONGFA GROUP CO., LTD.,
- Yongyao Yao
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Application
Dual Key Bi-Step Lock
- Publication number 20120060571
- Publication date Mar 15, 2012
- NINGBO YONGFA GROUP CO., LTD.,
- Yongyao Yu
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES