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Yongyao Yu

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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

Patents Applicationslast 30 patents

  • 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