Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5607024 | Stability enhanced drill bit and cutting structure having zones of varying wear resistance | Carl W. Keith | 1997-03-04 |
| 5607025 | Drill bit and cutting structure having enhanced placement and sizing of cutters for improved bit stabilization | Carl W. Keith | 1997-03-04 |
| 5592996 | Drill bit having improved cutting structure with varying diamond density | Carl W. Keith | 1997-01-14 |