Issued Patents All Time
Showing 51–75 of 138 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8011457 | Downhole hammer assembly | David R. Hall, John Bailey | 2011-09-06 |
| 8007051 | Shank assembly | David R. Hall, Ronald B. Crockett, Jeff Jepson, Tyson J. Wilde, Jad A. Mills +1 more | 2011-08-30 |
| 7997661 | Tapered bore in a pick | David R. Hall, Joe Fox | 2011-08-16 |
| 7992945 | Hollow pick shank | David R. Hall, Ronald B. Crockett, Jeff Jepson | 2011-08-09 |
| 7984772 | Downhole centrifugal drilling fluid separator | David R. Hall, Joe Fox, David Lundgreen | 2011-07-26 |
| 7980332 | Downhole centrifugal drilling fluid separator | David R. Hall, Joe Fox, David Lundgreen | 2011-07-19 |
| 7963617 | Degradation assembly | David R. Hall, Ronald B. Crockett | 2011-06-21 |
| 7946657 | Retention for an insert | David R. Hall | 2011-05-24 |
| 7946656 | Retention system | David R. Hall, Jonathan Marshall, Italo Elqueta, Tyson J. Wilde, Christopher Durrand | 2011-05-24 |
| 7938203 | Downhole centrifugal drilling fluid separator | David R. Hall, Joe Fox, David Lundgreen | 2011-05-10 |
| 7934570 | Data and/or PowerSwivel | David R. Hall, Jonathan Marshall | 2011-05-03 |
| 7887142 | Sensors on a degradation machine | David R. Hall, David Wahlquist, Thomas Morris | 2011-02-15 |
| 7871133 | Locking fixture | David R. Hall | 2011-01-18 |
| 7832809 | Degradation assembly shield | David R. Hall, Ronald B. Crockett | 2010-11-16 |
| 7762364 | Hybrid vehicle | David R. Hall | 2010-07-27 |
| 7744164 | Shield of a degradation assembly | David R. Hall, Ronald B. Crockett | 2010-06-29 |
| 7730975 | Drill bit porting system | David R. Hall, Jonathan Marshall | 2010-06-08 |
| 7730972 | Downhole turbine | David R. Hall, Jonathan Marshall | 2010-06-08 |
| 7669663 | Resettable actuator for downhole tool | David R. Hall, Nathan Nelson, David Lundgreen | 2010-03-02 |
| 7669674 | Degradation assembly | David R. Hall, Ronald B. Crockett | 2010-03-02 |
| 7661487 | Downhole percussive tool with alternating pressure differentials | David R. Hall, Jonathan Marshall | 2010-02-16 |
| 7650951 | Resettable actuator for downhole tool | David R. Hall, Nathan Nelson, David Lundgreen | 2010-01-26 |
| 7648210 | Pick with an interlocked bolster | David R. Hall, Jonathan Marshall | 2010-01-19 |
| 7649475 | Tool string direct electrical connection | David R. Hall | 2010-01-19 |
| 7641003 | Downhole hammer assembly | David R. Hall, John Bailey | 2010-01-05 |