Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6729601 | Extended range proportional valve | Paul W. Freisinger, John J. Haller | 2004-05-04 |
| 6619612 | Extended range proportional valve | Paul W. Freisinger, John J. Haller | 2003-09-16 |
| 6155531 | Proportional control value | Daniel M. Avis | 2000-12-05 |
| 6003552 | Rocker valve for sealing large orifices | John R. Shank, William G. Reeson | 1999-12-21 |
| 5887847 | Digitally controllable flow rate valve | — | 1999-03-30 |
| 5676342 | Proportional flow valve with diaphragm pressure member | Noel Otto, Scott M. Schipper | 1997-10-14 |
| 4976286 | Four-way slide valve | Gary Kramer | 1990-12-11 |
| 4385639 | Self-cycling valve | — | 1983-05-31 |