Haijiang Zhang

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Beijing, CN

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Patents Grantslast 30 patents

Information Patent Grant
Equipment system for no-roadway no-coal-pillar retained roadway min...
- Patent number 11,008,860
- Issue date May 18, 2021
- Manchao HE
- Manchao He
- E21 - EARTH DRILLING MINING
Information Patent Grant
System and method for testing gas migration process in coal-rock mass
- Patent number 8,418,526
- Issue date Apr 16, 2013
- China University of Mining & Technology ( Beijing)
- Manchao He
- G01 - MEASURING TESTING

Patents Applicationslast 30 patents

Information Patent Application
EQUIPMENT SYSTEM FOR NO-ROADWAY NO-COAL-PILLAR RETAINED ROADWAY MIN...
- Publication number 20180187548
- Publication date Jul 5, 2018
- Manchao HE
- E21 - EARTH DRILLING MINING
Information Patent Application
SYSTEM AND METHOD FOR TESTING GAS MIGRATION PROCESS IN COAL-ROCK MASS
- Publication number 20120118041
- Publication date May 17, 2012
- CHINA UNIVERSITY OF MINING & TECHNOLOGY (BEIJING)
- Manchao He
- G01 - MEASURING TESTING