He LIU

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Beijing, CN

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Patents Grantslast 30 patents

Information Patent Grant
Bridge type concentric direct reading testing and commissioning ins...
- Patent number 9,874,089
- Issue date Jan 23, 2018
- PetroChina Company Limited
- He Liu
- E21 - EARTH DRILLING MINING
Information Patent Grant
Bridge type concentric continuously adjustable water distributor
- Patent number 9,828,831
- Issue date Nov 28, 2017
- PetroChina Company Limited
- He Liu
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
BRIDGE-TYPE CONCENTRIC CONTINUOUSLY ADJUSTABLE WATER DISTRIBUTOR
- Publication number 20150376984
- Publication date Dec 31, 2015
- Petrochina Company Limited
- He LIU
- E21 - EARTH DRILLING MINING
Information Patent Application
BRIDGE-TYPE CONCENTRIC DIRECT READING TESTING AND COMMISSIONING INS...
- Publication number 20150369039
- Publication date Dec 24, 2015
- Petrochina Company Limited
- He LIU
- E21 - EARTH DRILLING MINING