Issued Patents All Time
Showing 26–34 of 34 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8550190 | Inner bit disposed within an outer bit | David R. Hall, Francis Leany, Marcus Skeem | 2013-10-08 |
| D678368 | Drill bit with a pointed cutting element | David R. Hall, Francis Leany, Ronald B. Crockett, Marcus Skeem | 2013-03-19 |
| 8365845 | High impact resistant tool | David R. Hall, Ronald B. Crockett, Michael Beazer | 2013-02-05 |
| D674422 | Drill bit with a pointed cutting element and a shearing cutting element | David R. Hall, Francis Leany, Ronald B. Crockett, Marcus Skeem | 2013-01-15 |
| 8141662 | Downhole lubrication system | David R. Hall, Francis Leany, Michael Beazer | 2012-03-27 |
| 8020637 | Downhole lubrication system | David R. Hall, Francis Leany, Michael Beazer | 2011-09-20 |
| 7641002 | Drill bit | David R. Hall, John Bailey | 2010-01-05 |
| 7628233 | Carbide bolster | David R. Hall, Scott Dahlgren | 2009-12-08 |
| 7533738 | Insert in a downhole drill bit | David R. Hall, Ashok Tamang | 2009-05-19 |