Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4331542 | Underdrain unit with air/water backwash for granular filtration system | — | 1982-05-25 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4331542 | Underdrain unit with air/water backwash for granular filtration system | — | 1982-05-25 |