Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6135218 | Fixed cutter drill bits with thin, integrally formed wear and erosion resistant surfaces | Douglas Caraway | 2000-10-24 |
| 5829539 | Rotary drill bit with hardfaced fluid passages and method of manufacturing | Alex Newton, Douglas Caraway, Andrew Murdock, Michael Barnes, Haydn R. Lamb | 1998-11-03 |
| 4989680 | Drill bit having improved hydraulic action for directing drilling fluid | Craig Ivie | 1991-02-05 |
| 4940099 | Cutting elements for roller cutter drill bits | Craig Ivie, Percy W. Schumacher | 1990-07-10 |
| 4907662 | Rotary drill bit having improved mounting means for multiple cutting elements | Percy W. Schumacher | 1990-03-13 |
| 4848489 | Drag drill bit having improved arrangement of cutting elements | — | 1989-07-18 |
| 4848476 | Drill bit having offset roller cutters and improved nozzles | Paul E. Pastusek | 1989-07-18 |
| 4794994 | Drag drill bit having improved flow of drilling fluid | Percy W. Schumacher | 1989-01-03 |
| 4741406 | Drill bit having offset roller cutters and improved nozzles | Paul E. Pastusek | 1988-05-03 |
| 4466622 | Compound dynamic seal for rolling cutter drill bit | Robert J. Kotch | 1984-08-21 |
| 4306727 | Dynamic seal for rolling cutter drill bit | Robert J. Kotch | 1981-12-22 |