Issued Patents 2021
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11021919 | Mud circulation system for reducing the swab pressure while tripping out | Feifei Zhang, YueZhi Wang, Xi Wang, Siyang Li | 2021-06-01 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11021919 | Mud circulation system for reducing the swab pressure while tripping out | Feifei Zhang, YueZhi Wang, Xi Wang, Siyang Li | 2021-06-01 |