Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6904984 | Stepped polycrystalline diamond compact insert | Roy D. Estes | 2005-06-14 |
| 5145017 | Kerf-cutting apparatus for increased drilling rates | Jesse L. Holster, Roy D. Estes, Paul G. Parys | 1992-09-08 |