Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5644956 | Rotary drill bit with improved cutter and method of manufacturing same | Mark P. Blackman, Jay S. Bird | 1997-07-08 |
| 5641029 | Rotary cone drill bit modular arm | Jay S. Bird | 1997-06-24 |