Chongli Zhang

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Beijing, CN

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Patents Grantslast 30 patents

Information Patent Grant
2(2-hydroxyphenyl)2H-benzotriazole compounds and homopolymers or co...
- Patent number 5,099,027
- Issue date Mar 24, 1992
- PPG Industries, Inc.
- Otto Vogl
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE