Issued Patents All Time
Showing 51–56 of 56 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5431239 | Stud design for drill bit cutting element | Gordon A. Tibbitts, Craig H. Cooley, Paul E. Pastusek, Ralph M. Horton | 1995-07-11 |
| 5355750 | Rolling cone bit with improved wear resistant inserts | Danny E. Scott, Gordon A. Tibbitts | 1994-10-18 |
| 5351772 | Polycrystalline diamond cutting element | — | 1994-10-04 |
| 5348108 | Rolling cone bit with improved wear resistant inserts | Danny E. Scott, Gordon A. Tibbitts | 1994-09-20 |
| 4919013 | Preformed elements for a rotary drill bit | Jeffrey B. Lund | 1990-04-24 |
| 4884477 | Rotary drill bit with abrasion and erosion resistant facing | Craig H. Cooley | 1989-12-05 |