Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4295489 | Pilot-operated back pressure regulator | Roger R. Arends, John W. Duffy, Brice D. Springer | 1981-10-20 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4295489 | Pilot-operated back pressure regulator | Roger R. Arends, John W. Duffy, Brice D. Springer | 1981-10-20 |