Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11780741 | Modular underdrain systems | Clifford Dale Barber, Darrell Wayne Christianson, Brian Leo Brink, Scott Allen Pallwitz, Chad Carpenter | 2023-10-10 |
| 11130693 | Combination biological contactor and self-backwashing filter systems | Thomas Martin Dumbaugh, Eric Allen Lawrence, Darrell Wayne Christianson, Brian Lee Primrose, Rene Ann Carson | 2021-09-28 |
| 10941050 | Modular underdrain systems | Clifford Dale Barber, Darrell Wayne Christianson, Brian Leo Brink, Scott Allen Pallwitz, Chad Carpenter | 2021-03-09 |