Chengyao LI

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Bejing, CN

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Patents Grantslast 30 patents

Information Patent Grant
Optical security device with full parallax diffraction optical vari...
- Patent number 10,493,788
- Issue date Dec 3, 2019
- ZHONGCHAO SPECIAL SECURITY TECHNOLOGY CO., LTD.
- Xiaoli Wang
- B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER

Patents Applicationslast 30 patents

Information Patent Application
OPTICAL SECURITY DEVICE WITH FULL PARALLAX DIFFRACTION OPTICAL VARI...
- Publication number 20180215188
- Publication date Aug 2, 2018
- ZHONGCHAO SPECIAL SECURITY TECHNOLOGY CO., LTD
- Xiaoli WANG
- B42 - BOOKBINDING ALBUMS FILES SPECIAL PRINTED MATTER