Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5348770 | Method of forming an uninterrupted refractory coating on a downhole drill bit cone | G. Kelly Sievers | 1994-09-20 |
| 5279374 | Downhole drill bit cone with uninterrupted refractory coating | G. Kelly Sievers | 1994-01-18 |