Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4642188 | Backwash apparatus for multi element filter unit | Sydney Hagerty | 1987-02-10 |
| 4297209 | High solids filter | John W. Rishel, Joe A. Kuiper | 1981-10-27 |
| 4218926 | Isolating pressure sensor | — | 1980-08-26 |