Issued Patents All Time
Showing 26–45 of 45 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5906245 | Mechanically locked drill bit components | Gordon A. Tibbitts | 1999-05-25 |
| 5873422 | Anti-whirl drill bit | Wayne R. Hansen, Jerry Cerkovnik | 1999-02-23 |
| 5678645 | Mechanically locked cutters and nozzles | Gordon A. Tibbitts | 1997-10-21 |
| 5497842 | Reamer wing for enlarging a borehole below a smaller-diameter portion therof | Corey S. Thayn | 1996-03-12 |
| 5495899 | Reamer wing with balanced cutting loads | Steve R. Matson | 1996-03-05 |
| 5431239 | Stud design for drill bit cutting element | Gordon A. Tibbitts, Craig H. Cooley, Redd H. Smith, Ralph M. Horton | 1995-07-11 |
| 5373908 | Chamfered cutting structure for downhole drilling | — | 1994-12-20 |
| 5172778 | Drill bit cutter and method for reducing pressure loading of cutters | Gordon A. Tibbitts | 1992-12-22 |
| 5115873 | Method and appartus for directing drilling fluid to the cutting edge of a cutter | — | 1992-05-26 |
| 4848476 | Drill bit having offset roller cutters and improved nozzles | John D. Deane | 1989-07-18 |
| 4741406 | Drill bit having offset roller cutters and improved nozzles | John D. Deane | 1988-05-03 |
| 4688647 | Drill bit having a failure indicator | Jeffery E. Daly | 1987-08-25 |
| 4611673 | Drill bit having offset roller cutters and improved nozzles | John S. Childers, Percy W. Schumacher | 1986-09-16 |
| 4610313 | Drill bit having a failure indicator | Jeffery E. Daly | 1986-09-09 |
| 4558754 | Drill bit having angled nozzles | John S. Childers | 1985-12-17 |
| 4548280 | Drill bit having a failure indicator | Jeffery E. Daly | 1985-10-22 |
| 4546837 | Drill bit having angled nozzles for improved bit and well bore cleaning | John S. Childers | 1985-10-15 |
| 4516642 | Drill bit having angled nozzles for improved bit and well bore cleaning | John S. Childers | 1985-05-14 |
| 4444281 | Combination drag and roller cutter drill bit | Percy W. Schumacher, Kenneth W. Jones, Henry W. Murdoch | 1984-04-24 |
| 4381824 | Drill bit lubrication system | — | 1983-05-03 |