Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE38989 | Skimmer filters for ponds | David B. Duensing, John M. Menhart | 2006-02-28 |
| 6054045 | Skimmer filters for ponds | John M. Menhart, David B. Duensing | 2000-04-25 |
| 5584991 | Filtration system for ponds | Gregory G. Wittstock | 1996-12-17 |