Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5199515 | Dry pneumatic system for hard rock shaft drilling | Kirk M. Sinclair | 1993-04-06 |
| 5125692 | Dry pneumatic system for hard rock shaft drilling | Kirk M. Sinclair | 1992-06-30 |
| 4637475 | In-the-hole drill | Richard L. Riach | 1987-01-20 |
| 4610317 | Spherical bit | Donald A. Desjardins | 1986-09-09 |
| 4284154 | Non-rotating spring loaded stabilizer | — | 1981-08-18 |