Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6125883 | Floor mounted double containment low profile sump pump assembly | Richard A. Hallett | 2000-10-03 |
| 6017446 | Floor mounted filtration system | Eugene H. Harms, Stephen N. McEwen, Michael Harms | 2000-01-25 |
| 5961847 | Filter apparatus with dual drive loops | Stephen N. McEwen, Richard A. Hallett, Clayton E. Tenniswood | 1999-10-05 |
| 4919824 | Roller/squeezer deliquifier | Matthew Olen Kelley | 1990-04-24 |
| 4761226 | Continuously operable power actuated vacuum filter | — | 1988-08-02 |
| 4746444 | Prevention of chip build-up in filtration equipment | — | 1988-05-24 |
| RE32135 | Compact universal drum filter settler | Robert J. Fox, Ted W. Guelde, Eugene H. Harms, Stephen N. McEwen | 1986-05-06 |
| 4428838 | Tubular filter structure | Timothy J. Hainen, Stephen N. McEwen | 1984-01-31 |
| 4421645 | Compact universal drum filter settler | Robert J. Fox, Ted W. Guelde, Eugene H. Harms, Stephen N. McEwen | 1983-12-20 |