Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12000222 | Pressure compensation device with accumulator group for controlled pressure drilling | Jinshan Ma, Baojiang Sun, Jintao Qi, Liming Wei, Fengliang Xi +13 more | 2024-06-04 |