Issued Patents 2017
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9850716 | Remote-controlled adjustable-speed screw drill for gas-drive hydraulic-motive during gas drilling | Ying Zhang, Zhanghua Lian, Qiang Zhang, Yong He, Gao Li +2 more | 2017-12-26 |