Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4600064 | Earth boring bit with bearing sleeve | Duane Shotwell, Gerald O. Atkinson | 1986-07-15 |
| 4228339 | Method of hardfacing tool joints | Eric C. Sullivan | 1980-10-14 |
| 4211508 | Earth boring tool with improved inserts | Herbert C. Dill | 1980-07-08 |
| 4188242 | Combination carburizing and boronizing methods | — | 1980-02-12 |