Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10143944 | Filter underdrain with internal air scour laterals | Brendan Kelly | 2018-12-04 |
| 9861912 | Rapid sludge removal clarifier | Jeffrey C. Kauppila | 2018-01-09 |
| 6691413 | Underdrain filtration system with stamped perforations | — | 2004-02-17 |
| 6569328 | Underdrain filtration system with stamped perforations | — | 2003-05-27 |
| 6090284 | Underdrain unit for granular filtration system | Milton R. Melber | 2000-07-18 |