Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8991515 | Fail-resistant hammer assembly for a valveless percussive drill | — | 2015-03-31 |
| 7371009 | Split gib mounting arrangement for drilling components | Timothy D. Burgess | 2008-05-13 |
| 6698529 | Translating turret rock bolter | Perry L. Coombs, Paul Bigoney | 2004-03-02 |
| 6413019 | Turret rock bolter with stinger/centralizer | Perry L. Coombs, Paul Bigoney | 2002-07-02 |
| 5720582 | Bolt delivery system with linear bolt magazine | Perry L. Coombs | 1998-02-24 |
| 5690449 | Tool base securing system | Perry L. Coombs | 1997-11-25 |
| 5597267 | Bolt delivery system | Perry L. Coombs | 1997-01-28 |
| 5556235 | Rock bolter | Perry L. Coombs | 1996-09-17 |
| 5494380 | Resin injector system | Perry L. Coombs | 1996-02-27 |
| 5330012 | Feed shell lubrication manifold | — | 1994-07-19 |
| 5040618 | Pneumatic drill | Arthur A. Michaud | 1991-08-20 |
| 4957171 | Pneumatic drill | Arthur A. Michaud | 1990-09-18 |
| 4550785 | Hammer | George A. Hibbard | 1985-11-05 |
| 4420277 | Mine roof driller-bolter apparatus and method | George A. Hibbard, Ralph C. Lumbra | 1983-12-13 |
| 4260029 | Midpoint centralizer | Ralph C. Lumbra | 1981-04-07 |