Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5145017 | Kerf-cutting apparatus for increased drilling rates | Roy D. Estes, Jack Castle, Paul G. Parys | 1992-09-08 |
| 4892159 | Kerf-cutting apparatus and method for improved drilling rates | — | 1990-01-09 |