Issued Patents 2021
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11021919 | Mud circulation system for reducing the swab pressure while tripping out | Feifei Zhang, Yidi Wang, YueZhi Wang, Xi Wang | 2021-06-01 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11021919 | Mud circulation system for reducing the swab pressure while tripping out | Feifei Zhang, Yidi Wang, YueZhi Wang, Xi Wang | 2021-06-01 |