Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D340844 | Adjustable rake extension | — | 1993-11-02 |
| 4878548 | Nozzle retention system for a drill bit | Alfred Ostertag, Craig R. Hyland, Kenneth D. Enever, Steven R. Radford | 1989-11-07 |