Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9932784 | Device for handling oil pipes and method for workover | Zenglin Wang, Lei Zhang, Zeng Fu, Huihui Song, Qingsheng Jia +6 more | 2018-04-03 |
| 9732570 | Apparatus for tripping oil pipe and system for automatic well workover | Minxuan Wang, Lei Zhang, Huihui Song, Zeng Fu, Hui Zhang +6 more | 2017-08-15 |
| 8746093 | Oil pumping unit | Minxuan Wang, Jianli XU, Zhengquan CHENG, Bin Wei, Zhonghui Zhang +3 more | 2014-06-10 |