Issued Patents 1994
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5351770 | Ultra hard insert cutters for heel row rotary cone rock bit applications | Chris E. Cawthorne, Scott D. McDonough, Gary R. Portwood | 1994-10-04 |
| 5341890 | Ultra hard insert cutters for heel row rotary cone rock bit applications | Chris E. Cawthorne, Gary R. Portwood | 1994-08-30 |
| 5322138 | Chisel insert for rock bits | — | 1994-06-21 |