Issued Patents 2020
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10577891 | Using horizontal directional drilling and liquid nitrogen cyclic freeze-thaw process to improve permeability in gas drainage | Cheng Zhai, Lei Qin, Jizhao Xu, Zongqing Tang, Shiliang Wu | 2020-03-03 |