Yi Tian

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Beijing, CN

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Patents Grantslast 30 patents

Information Patent Grant
Mechanical and hydraulic dual-effect expansion device for well dril...
- Patent number 10,641,067
- Issue date May 5, 2020
- China National Petroleum Corporation
- Binggui Xu
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
MECHANICAL AND HYDRAULIC DUAL-EFFECT EXPANSION DEVICE FOR WELL DRIL...
- Publication number 20180202267
- Publication date Jul 19, 2018
- CHINA NATIONAL PETROLEUM CORPORATION
- Binggui XU
- E21 - EARTH DRILLING MINING