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Hengfeng LIU
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Xuzhou, Jiangsu, CN
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Patents Grants
last 30 patents
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Patent Grant
Method for recovering room-type coal pillars by cemented filling of...
Patent number
11,339,658
Issue date
May 24, 2022
China University of Mining and Technology
Nan Zhou
E21 - EARTH DRILLING MINING
Information
Patent Grant
Method of recovering room-and-pillar coal pillar by using external...
Patent number
11,021,954
Issue date
Jun 1, 2021
China University of Mining and Technology
Nan Zhou
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents
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Patent Application
METHOD FOR RECOVERING ROOM-TYPE COAL PILLARS BY CEMENTED FILLING OF...
Publication number
20210355826
Publication date
Nov 18, 2021
CHINA UNIVERSITY OF MINING AND TECHNOLOGY
Nan Zhou
E21 - EARTH DRILLING MINING
Information
Patent Application
MINE EXPLOITATION, SEPARATION, FILLING AND TREATMENT EXPLOITATION M...
Publication number
20200378256
Publication date
Dec 3, 2020
CHINA UNIVERSITY OF MINING AND TECHNOLOGY
Jixiong ZHANG
E21 - EARTH DRILLING MINING
Information
Patent Application
METHOD OF RECOVERING ROOM-AND-PILLAR COAL PILLAR BY USING EXTERNAL...
Publication number
20200318480
Publication date
Oct 8, 2020
CHINA UNIVERSITY OF MINING AND TECHNOLOGY
Nan ZHOU
E21 - EARTH DRILLING MINING