Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6321916 | Liquid clarification tank | Henry E. Rickelm, Donald N. Ruehrwein | 2001-11-27 |
| 6171498 | Upflow water clarifier with central pier | John J. Fassbender, David K. Wyness | 2001-01-09 |
| 6092671 | Liquid clarification tank | Donald N. Ruehrwein, David K. Wyness | 2000-07-25 |
| D424156 | Industrial or municipal water clarifier | John J. Fassbender, Deanna F. Young | 2000-05-02 |
| 5958249 | Method and apparatus for withdrawing effluent from a solids-contacting vessel | John J. Fassbender, Donald N. Ruehrwein | 1999-09-28 |
| 5695648 | Method and apparatus for withdrawing effluent from a solids-contacting vessel having an adjustable weir | John J. Fassbender, Donald N. Ruehrwein | 1997-12-09 |