Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6770194 | Water overflow device and water return device | — | 2004-08-03 |
| 6056886 | Water level and flow control device and skimmer box provided with this device | Roy S. Hickok | 2000-05-02 |
| 5868926 | Rotating biological filter system | Roy S. Hickok | 1999-02-09 |
| 5779885 | Rotating biological filter system | Roy S. Hickok | 1998-07-14 |