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Patent applications and USPTO patent grants for Liu; Hengfeng.The latest application filed is for "method for recovering room-type coal pillars by cemented filling of reserved roadways".
Patent | Date |
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Method for recovering room-type coal pillars by cemented filling of reserved roadways Grant 11,339,658 - Zhou , et al. May 24, 2 | 2022-05-24 |
Method For Recovering Room-type Coal Pillars By Cemented Filling Of Reserved Roadways App 20210355826 - Zhou; Nan ;   et al. | 2021-11-18 |
Method of recovering room-and-pillar coal pillar by using external replacement supports Grant 11,021,954 - Zhou , et al. June 1, 2 | 2021-06-01 |
Mine Exploitation, Separation, Filling And Treatment Exploitation Method App 20200378256 - ZHANG; Jixiong ;   et al. | 2020-12-03 |
Method Of Recovering Room-and-pillar Coal Pillar By Using External Replacement Supports App 20200318480 - ZHOU; Nan ;   et al. | 2020-10-08 |
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