Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4428588 | Radial belleville seal with encapsulated resilient core member | — | 1984-01-31 |
| 4394020 | High-speed seal | — | 1983-07-19 |
| 4388984 | Two-stage pressure relief valve | — | 1983-06-21 |
| 4344629 | Self-lapping high speed seal with wear-in lip | — | 1982-08-17 |
| 4181377 | Rock bit having an improved cone retention system | — | 1980-01-01 |