Jianlin Yao

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Guanghan, Sichuan, CN

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Patents Grantslast 30 patents

Information Patent Grant
Dual-speed dual—core enhanced drilling equipment
- Patent number 11,225,837
- Issue date Jan 18, 2022
- CNPC CHUANQING DRILLING ENGINEERING COMPANY LIMITED
- Liexiang Han
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Dual-speed dual - core enhanced drilling equipment
- Publication number 20210198950
- Publication date Jul 1, 2021
- CNPC Chuanqing Drilling Engineering Company Limited
- LIEXIANG HAN
- E21 - EARTH DRILLING MINING
Information Patent Application
Particle drilling method
- Publication number 20180106112
- Publication date Apr 19, 2018
- CCDC PETROLEUM DRILLING & PRODUCTION TECHNOLOGY CO., LTD.
- Weicheng Li
- E21 - EARTH DRILLING MINING