Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9441423 | Drilling rig masts and methods of assembly and erection | Robert Benjamin Donnally, Chunqiao Ren, Xi Lin Liu, Hui SHENG, Yan Yu | 2016-09-13 |
| 8549815 | Drilling rig masts and methods of assembly and erecting masts | Robert Benjamin Donnally, Chunqiao Ren, Xi Lin Liu, Hui SHENG, Yan Yu | 2013-10-08 |
| 8468753 | Drilling rigs and erection methods | Robert Benjamin Donnally, Chunqiao Ren, Xi Lin Liu, Hui SHENG, Yan Yu | 2013-06-25 |
| 8250816 | Drilling rig structure installation and methods | Robert Benjamin Donnally, Chunqiao Ren, Xi Lin Liui, Hui SHENG, Yan Yu +1 more | 2012-08-28 |
| 8047303 | Drilling rig drawworks installation | Robert Benjamin Donnally, Chunqiao Ren, Xi Lin Liu, Hui SHENG, Yan Yu | 2011-11-01 |