He Hui Chen

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Shanghai, CN

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Patents Grantslast 30 patents

Information Patent Grant
Drilling rig structure installation and methods
- Patent number 8,250,816
- Issue date Aug 28, 2012
- National Oilwell Varco LP
- Robert Benjamin Donnally
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Drilling rig structure installation and methods
- Publication number 20090218138
- Publication date Sep 3, 2009
- Robert Benjamin Donnally
- E21 - EARTH DRILLING MINING