Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9488013 | Bi-directionally raisable drilling rig mast | Robert Benjamin Donnally, Xilin Liu | 2016-11-08 |
| 9441423 | Drilling rig masts and methods of assembly and erection | Robert Benjamin Donnally, Stuart Arthur Lyall McCurdy, Xi Lin Liu, Hui SHENG, Yan Yu | 2016-09-13 |
| 9163462 | Bi-directionally raisable drilling rig mast | Robert Benjamin Donnally, Xilin Liu | 2015-10-20 |
| 8904716 | Bi-directionally raisable drilling rig mast | Robert Benjamin Donnally, Xilin Liu | 2014-12-09 |
| 8875911 | Drilling rig mast lift systems and methods | Robert Benjamin Donnally, Xi Lin Liu, Yan Yu, Peng Yue, Wei Wang | 2014-11-04 |
| 8863449 | Substructure of a mobile drilling rig with a movable center floor section | Robert Benjamin Donnally, Xilin Liu | 2014-10-21 |
| 8549815 | Drilling rig masts and methods of assembly and erecting masts | Robert Benjamin Donnally, Stuart Arthur Lyall McCurdy, Xi Lin Liu, Hui SHENG, Yan Yu | 2013-10-08 |
| 8468753 | Drilling rigs and erection methods | Robert Benjamin Donnally, Stuart Arthur Lyall McCurdy, Xi Lin Liu, Hui SHENG, Yan Yu | 2013-06-25 |
| 8250816 | Drilling rig structure installation and methods | Robert Benjamin Donnally, Stuart Arthur Lyall McCurdy, Xi Lin Liui, Hui SHENG, Yan Yu +1 more | 2012-08-28 |
| 8047303 | Drilling rig drawworks installation | Robert Benjamin Donnally, Stuart Arthur Lyall McCurdy, Xi Lin Liu, Hui SHENG, Yan Yu | 2011-11-01 |