Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5452628 | Cold headed center vacuum drill bit | Robert H. Montgomery, Jr., Daniel C. Sheirer, Paul Ewing | 1995-09-26 |
| 5297643 | Cold headed center vacuum drill bit | Robert H. Montgomery, Jr., Daniel C. Sheirer, Paul Ewing | 1994-03-29 |