Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7128839 | Process and system for enhanced nitrogen removal in a wetland and recirculating sand filter wastewater treatment system | Thomas E. Vik | 2006-10-31 |
| 6582156 | Level control device for wetlands wastewater treatment facilities | — | 2003-06-24 |
| 6558555 | Process and system for enhanced phosphorus removal in a wetland wastewater treatment facility | — | 2003-05-06 |
| 6447682 | Process and system for enhanced nitrogen removal in a wetland wastewater treatment facility | — | 2002-09-10 |