Yongfeng Guo

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Hebei Province, CN

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Patents Grantslast 30 patents

Information Patent Grant
Submarine device
- Patent number 8,899,333
- Issue date Dec 2, 2014
- China National Offshore Oil Corporation
- Yongfeng Guo
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Submarine Device
- Publication number 20100243262
- Publication date Sep 30, 2010
- CHINA NATIONAL OFFSHORE OIL CORPORATION
- Yongfeng Guo
- E21 - EARTH DRILLING MINING