Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4597455 | Rock bit lubrication system | David T. Brunson, William R. Bell | 1986-07-01 |
| 4330158 | Rotary rock bit with improved thrust flange | — | 1982-05-18 |
| 4183416 | Cutter actuated rock bit lubrication system | — | 1980-01-15 |