Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10161190 | Drill bit seal and method of using same | — | 2018-12-25 |
| 7036613 | Lip seal for roller cone drill bit | — | 2006-05-02 |
| 6427790 | Rock bit face seal having lubrication gap | — | 2002-08-06 |
| 6247545 | Single energizer face seal for rocks bits with floating journal bearings | Jeffery E. Daly | 2001-06-19 |
| 6176330 | Rock bit face seal having anti-rotation pins | — | 2001-01-23 |
| 4899838 | Earth boring bit with convergent cutter bearing | Eric C. Sullivan | 1990-02-13 |
| 4753303 | Earth boring bit with two piece bearing and rigid face seal assembly | — | 1988-06-28 |
| 4671368 | Earth boring bit with shear compression seal | — | 1987-06-09 |
| 4666001 | Earth boring bit with improved rigid face seal assembly | — | 1987-05-19 |
| 4519719 | Earth boring bit with pressure compensating bearing seal | — | 1985-05-28 |
| 4516641 | Earth boring bit with pressure compensating rigid face seal | — | 1985-05-14 |
| 4491428 | Earth boring drill bit with snap ring cutter retention | George E. Dolezal, Edward M. Galle | 1985-01-01 |
| 4404840 | Device for evaluating abrasive wear of elastomeric O-ring materials | Kurt M. Marshek | 1983-09-20 |