Issued Patents 2011
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8028768 | Displaceable plug in a tool string filter | David R. Hall, Paula Turner | 2011-10-04 |
| 7984772 | Downhole centrifugal drilling fluid separator | David R. Hall, Joe Fox, Scott Dahlgren | 2011-07-26 |
| 7980332 | Downhole centrifugal drilling fluid separator | David R. Hall, Joe Fox, Scott Dahlgren | 2011-07-19 |
| 7938203 | Downhole centrifugal drilling fluid separator | David R. Hall, Joe Fox, Scott Dahlgren | 2011-05-10 |
| 7900720 | Downhole drive shaft connection | David R. Hall, Paula Turner, Daryl Wise, Nathan Nelson, Andrew Pilgrim +1 more | 2011-03-08 |
| 7866416 | Clutch for a jack element | David R. Hall | 2011-01-11 |