Xu Tian

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=Zhengzhou, CN

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Patents Grantslast 30 patents

Information Patent Grant
Soundproof door system
- Patent number 12,012,802
- Issue date Jun 18, 2024
- State Grid Henan Electric Power Research Institute
- Donghui Wang
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES

Patents Applicationslast 30 patents

Information Patent Application
SOUNDPROOF DOOR SYSTEM
- Publication number 20230112167
- Publication date Apr 13, 2023
- State Grid Henan Electric Power Research Institute
- Donghui Wang
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES