Xiaojun Li

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Urumqi City, CN

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Patents Grantslast 30 patents

Information Patent Grant
Torsion impact speed acceleration device
- Patent number 10,538,968
- Issue date Jan 21, 2020
- CNPC Xibu Drilling Engineering Company Limited
- Ruoming Chen
- E21 - EARTH DRILLING MINING
Information Patent Grant
Ball-dropping sliding sleeve with a removable ball seat
- Patent number 10,494,901
- Issue date Dec 3, 2019
- CNPC Xibu Drilling Engineering Company Limited
- Shengpeng Zhang
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
TORSION IMPACT SPEED ACCELERATION DEVICE
- Publication number 20180171717
- Publication date Jun 21, 2018
- CNPC Xibu Drilling Engineering Company Limited
- Ruoming CHEN
- E21 - EARTH DRILLING MINING
Information Patent Application
BALL-DROPPING SLIDING SLEEVE WITH A REMOVABLE BALL SEAT
- Publication number 20180051538
- Publication date Feb 22, 2018
- CNPC Xibu Drilling Engineering Company Limited
- Shengpeng Zhang
- E21 - EARTH DRILLING MINING