Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7168856 | Wet cup throat seal and bearing assembly | Mark T. Weinberger, Mark D. Hilde | 2007-01-30 |
| 5176176 | Non-degrading back pressure regulator | Richard Lewis | 1993-01-05 |
| 4887639 | Non-degrading pressure regulator | Richard Lewis, Larry J. DeHemmer | 1989-12-19 |