Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6056886 | Water level and flow control device and skimmer box provided with this device | Roger W. McGrath | 2000-05-02 |
| 5868926 | Rotating biological filter system | Roger W. McGrath | 1999-02-09 |
| 5779885 | Rotating biological filter system | Roger W. McGrath | 1998-07-14 |
| 5679253 | Rotating biological aquarium filter system | Charles O. Fuerst | 1997-10-21 |
| 5603831 | Dual impeller pump | — | 1997-02-18 |
| 5449454 | Gas expelling device for a canister type filter | — | 1995-09-12 |
| 5419831 | Rotating biological aquarium filter system | Charles O. Fuerst | 1995-05-30 |
| 5401401 | Hang on tank canister filter | Charles O. Fuerst | 1995-03-28 |