CNPC Bohai Drilling Engineering Company Limited

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Tianjin, CN

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Patents Grantslast 30 patents

Information Patent Grant
Process for preparing metal-chelate retarder by sol-gel method
- Patent number 11,603,488
- Issue date Mar 14, 2023
- SOUTHWEST PETROLEUM UNIVERSITY
- Xiaowei Cheng
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Multi-level sliding sleeve
- Patent number 9,366,110
- Issue date Jun 14, 2016
- CNPC Bohai Drilling Engineering Company Limited
- Qiang Feng
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
PROCESS FOR PREPARING METAL-CHELATE RETARDER BY SOL-GEL METHOD
- Publication number 20210079288
- Publication date Mar 18, 2021
- SOUTHWEST PETROLEUM UNIVERSITY
- Xiaowei CHENG
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Application
MULTI-LEVEL SLIDING SLEEVE
- Publication number 20140182838
- Publication date Jul 3, 2014
- CNPC Bohai Drilling Engineering Company Limited
- Qiang FENG
- E21 - EARTH DRILLING MINING

Trademarklast 30 trademarks