Issued Patents All Time
Showing 26–29 of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5592996 | Drill bit having improved cutting structure with varying diamond density | Carl W. Keith | 1997-01-14 |
| 5582261 | Drill bit having enhanced cutting structure and stabilizing features | Carl W. Keith | 1996-12-10 |
| 5551522 | Drill bit having stability enhancing cutting structure | Carl W. Keith | 1996-09-03 |
| 5549171 | Drill bit with performance-improving cutting structure | Carl W. Keith | 1996-08-27 |