Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9617808 | Continuous oil pipe clamp mechanism | Dong Liu, Qingfeng Yu | 2017-04-11 |
| 9493997 | Floating clamping device for injection head of continuous oil pipe | Dong Liu, Qingfeng Yu | 2016-11-15 |