Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4610579 | Core drill bit with dynamic cooling fluid flow control means | Robert G. Frank, Joseph B. Kelly, Robert L. Bowers | 1986-09-09 |
| 4541758 | Means and method for lubricating core drills | Robert G. Frank | 1985-09-17 |