Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5390747 | Well rig lift system and a hydraulic energy-storing well rig lift system | Xinyi Gu, Yunan WANG, Wei-Kuang Pan, Dongchang Sun, Zhian Liu +1 more | 1995-02-21 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5390747 | Well rig lift system and a hydraulic energy-storing well rig lift system | Xinyi Gu, Yunan WANG, Wei-Kuang Pan, Dongchang Sun, Zhian Liu +1 more | 1995-02-21 |