Issued Patents All Time
Showing 26–27 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7426968 | Drill bit assembly with a probe | David R. Hall, Francis Leany, Paula Turner, Christopher Durrand, Daryl Wise | 2008-09-23 |
| 7360610 | Drill bit assembly for directional drilling | David R. Hall, Francis Leany, Scott Dahlgren, Daryl Wise | 2008-04-22 |