Issued Patents 2022
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11506041 | Drilling-slitting-sealing-fracturing device and method for a deep low-permeability gassy coal seam | Gang Wang, Zhiyuan Liu, Weimin Cheng, Xiangjie Qin, Jiuyuan Fan +5 more | 2022-11-22 |
| 11396810 | Full-length screen pipe hole protection device and method with pressurized hole packing in soft coal seam | Kai Dong, Weimin Cheng, Jingna Xie, Gang Wang, Yixin Liu +1 more | 2022-07-26 |