Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5507357 | Pilot bit for use in auger bit assembly | Vern Hult | 1996-04-16 |
| 4860838 | Latching bit sub | — | 1989-08-29 |
| 4385668 | Inner pipe support arrangement for double-walled drill pipe | Floyd W. Becker | 1983-05-31 |