Issued Patents All Time
Showing 26–38 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6843909 | Three-stage aquarium filtration | — | 2005-01-18 |
| 6684818 | Birdcage perch | Jonathan Willinger | 2004-02-03 |
| 6431118 | Apparatus and method for providing humidified air to a terrarium | — | 2002-08-13 |
| 6391399 | Artificial aquatic plant system | — | 2002-05-21 |
| 5397463 | Aerobic aquarium filter chamber | — | 1995-03-14 |
| 5246571 | Clogging indicator for an aquarium filter | — | 1993-09-21 |
| 5053125 | Filter cartridge | Allan H. Willinger | 1991-10-01 |
| 4894151 | Filter cartridge for an undergravel aquarium filter | — | 1990-01-16 |
| 4880549 | Method of filtering in an aquarium tank with a filter envelope | Allan H. Willinger | 1989-11-14 |
| 4842727 | Aquarium filter | Allan H. Willinger | 1989-06-27 |
| 4783258 | Filter cartridge with reuseable framework | Allan H. Willinger | 1988-11-08 |
| 4761227 | Self priming aquarium filter | Allan H. Willinger | 1988-08-02 |
| 4285813 | Aquarium filtration apparatus | James B. Stewart, Edwin E. Faris, Sheldon Schmidt | 1981-08-25 |