Chen LIU

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Beijing, CN

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Patents Grantslast 30 patents

Information Patent Grant
Washpipe assembly
- Patent number 9,976,359
- Issue date May 22, 2018
- Xuejun Li
- E21 - EARTH DRILLING MINING
Information Patent Grant
Torque wrench apparatus and method for making and breaking joints
- Patent number 9,546,526
- Issue date Jan 17, 2017
- Xuejun Li
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
TORQUE WRENCH APPARATUS AND METHOD FOR MAKING AND BREAKING JOINTS
- Publication number 20160369579
- Publication date Dec 22, 2016
- Xuejun LI
- E21 - EARTH DRILLING MINING
Information Patent Application
WASHPIPE ASSEMBLY
- Publication number 20160369575
- Publication date Dec 22, 2016
- Xuejun LI
- E21 - EARTH DRILLING MINING