Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6521126 | Pipe gallery for water filtration systems | — | 2003-02-18 |
| 6171498 | Upflow water clarifier with central pier | John J. Fassbender, Daniel H. Phillips | 2001-01-09 |
| 6092671 | Liquid clarification tank | Donald N. Ruehrwein, Daniel H. Phillips | 2000-07-25 |
| 5866019 | Method for backwashing filters in a water treatment plant with clarifier and peripheral filter cells | — | 1999-02-02 |
| 5804062 | Water treatment plant with clarifier and peripheral filter | — | 1998-09-08 |
| 5735600 | Method and apparatus for automatically mixing drinking water in a reservoir | Donald N. Ruehrwein, John S. Andrepont | 1998-04-07 |
| 5605636 | Liquid clarification device and method | — | 1997-02-25 |
| 4765891 | Helical flow effluent weir | — | 1988-08-23 |
| 4614596 | Apparatus and method for dissolving a gas in an aqueous stream | — | 1986-09-30 |