Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9651124 | Oil pumping unit with pinion reciprocating on rack | — | 2017-05-16 |
| 8047821 | Ring rack oil pumping machine | Huanbo Zhou, Yonghai LIU, Zhisheng Tian, Zhengyou Feng | 2011-11-01 |
| 5390747 | Well rig lift system and a hydraulic energy-storing well rig lift system | Yunan WANG, Wei-Kuang Pan, Guihua Luan, Dongchang Sun, Zhian Liu +1 more | 1995-02-21 |