Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11339658 | Method for recovering room-type coal pillars by cemented filling of reserved roadways | Nan Zhou, Meng Li, Hao Yan, Jixiong Zhang | 2022-05-24 |
| 11021954 | Method of recovering room-and-pillar coal pillar by using external replacement supports | Nan Zhou, Meng Li, Zhongya Wu, Jixiong Zhang | 2021-06-01 |