Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5080183 | Seal assembly for roller cutter drill bit having a pressure balanced lubrication system | James C. Walter | 1992-01-14 |
| 5040624 | Seal assembly for roller cutter drill bit having a pressure balanced lubrication system | James C. Walter | 1991-08-20 |
| 4940099 | Cutting elements for roller cutter drill bits | John D. Deane, Craig Ivie | 1990-07-10 |
| 4907662 | Rotary drill bit having improved mounting means for multiple cutting elements | John D. Deane | 1990-03-13 |
| 4830123 | Mounting means for cutting elements in drag type rotary drill bit | Jeffery E. Daly | 1989-05-16 |
| 4794994 | Drag drill bit having improved flow of drilling fluid | John D. Deane | 1989-01-03 |
| 4682663 | Mounting means for cutting elements in drag type rotary drill bit | Jeffery E. Daly | 1987-07-28 |
| 4657093 | Rolling cutter drill bit | — | 1987-04-14 |
| 4623028 | Seal assembly for drill bits | Henry W. Murdoch | 1986-11-18 |
| 4611673 | Drill bit having offset roller cutters and improved nozzles | John S. Childers, Paul E. Pastusek | 1986-09-16 |
| 4446935 | Intermittent high-drag oil well drilling bit | — | 1984-05-08 |
| 4444281 | Combination drag and roller cutter drill bit | Kenneth W. Jones, Henry W. Murdoch, Paul E. Pastusek | 1984-04-24 |
| 4334586 | Inserts for drilling bits | — | 1982-06-15 |