Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7168511 | Rotary drill bit having cutting insert with a notch | Lynn A. Alcorn | 2007-01-30 |
| 6574527 | Method of selecting a cutting system | James C. Courtney, Daniel C. Statler, Kenneth J. Topka | 2003-06-03 |
| 5833017 | Cutting bit assembly for impinging an earth strata | Percy D. Bollman, Cary D. Ritchey | 1998-11-10 |
| 5325931 | Chuck assembly for a drill box of a mine drill | — | 1994-07-05 |
| 5310015 | Insert spacer assembly | Steven D. Shirk | 1994-05-10 |
| 5226489 | Insert spacer assembly | Steven D. Shirk | 1993-07-13 |
| 5184689 | Radial cut drill bit insert | Daniel C. Sheirer, Robert H. Montgomery, Jr. | 1993-02-09 |
| 5184925 | Insert and insert support bar | Steven D. Shirk | 1993-02-09 |
| 5172775 | Rotary drill bit insert | Daniel C. Sheirer, Robert H. Montgomery, Jr. | 1992-12-22 |