Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5699868 | Rotary drill bits having nozzles to enhance recirculation | Douglas Caraway, Graham Watson | 1997-12-23 |
| 5598750 | Elements faced with superhard material | Nigel Dennis Griffin | 1997-02-04 |