Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9051794 | High impact shearing element | David R. Hall, Ronald B. Crockett, John Bailey | 2015-06-09 |
| 7591327 | Drilling at a resonant frequency | David R. Hall, John Balley, Joe Fox | 2009-09-22 |
| D554162 | Diamond enhanced cutting element | David R. Hall, Ronald B. Crockett, John Bailey | 2007-10-30 |