Issued Patents 2022
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11306540 | Push type rotary guide drilling system | Qingbo Liu, Qingyun Di, Xiangyang Wang, Yongyou Yang, Qijun Xie | 2022-04-19 |
| 11274542 | Self-adjusting damping vibration absorber for while-drilling instruments and adjusting method thereof | Qingyun Di, Jiansheng Du | 2022-03-15 |