Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9059606 | Surface motor direct-drive sucker-rod screw pump device | Jun Liu, Yongjian Tang, Hengli Cong | 2015-06-16 |
| 8702400 | Surface motor direct-drive sucker-rod screw pump device | Jun Liu, Yongjian Tang, Hengli Cong | 2014-04-22 |