Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4616836 | Reverse lip positive venting seal | Dennis L. Otto, Donald K. Ross | 1986-10-14 |
| 4556225 | Reverse lip positive venting seal | Dennis L. Otto, Donald K. Ross | 1985-12-03 |
| 4421326 | Oil seals with mounting surface vent mechanisms | — | 1983-12-20 |