Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10012080 | Skip-mining type wangeviry stope branch roadway filling and coal mining method | Liqiang Ma, Yinzhong Zhang, Jiaxue Wang, Junjie Wang, Maoping Zhao +4 more | 2018-07-03 |
| 9689258 | Water-preserved-mining roof-contacted filling method for controlling fissure of overlying strata and surface subsidence | Liqiang Ma, Zhiyuan Jin, Fei Wang, Hai Sun | 2017-06-27 |