Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5072795 | Pressure compensator for drill bit lubrication system | Steve R. Delgado, Frank Hall | 1991-12-17 |
| 4838365 | Seal assembly for rotary drill bits | — | 1989-06-13 |
| 4619534 | Roller cutter drill bit having a texturized seal member | Jeffery E. Daly | 1986-10-28 |
| 4466622 | Compound dynamic seal for rolling cutter drill bit | John D. Deane | 1984-08-21 |
| 4306727 | Dynamic seal for rolling cutter drill bit | John D. Deane | 1981-12-22 |