Xiaofeng Yang

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Beiing, CN

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Patents Grantslast 30 patents

Information Patent Grant
Negative voltage backflow direct current supply system for rail tra...
- Patent number 10,744,880
- Issue date Aug 18, 2020
- Beijing Efficiengine Technology LLC
- Qionglin Zheng
- B60 - VEHICLES IN GENERAL

Patents Applicationslast 30 patents

Information Patent Application
NEGATIVE VOLTAGE BACKFLOW DIRECT CURRENT SUPPLY SYSTEM FOR RAIL TRA...
- Publication number 20180208063
- Publication date Jul 26, 2018
- Beijing Efficiengine Technology LLC
- Qionglin Zheng
- B60 - VEHICLES IN GENERAL