Willinger Brothers, Inc.
11Patents
0Active
11Granted
32Portfolio score
Filing activity: Oct 30, 1987 → Jul 26, 1990
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4842727A | Aquarium filter | Emerging Cross-Sectional Technologies | 39 | Expired |
| US4997559A | Aquarium filter assembly with restricted pumping window | Human Necessities | 25 | Expired |
| US4880549A | Method of filtering in an aquarium tank with a filter envelope | Human Necessities | 22 | Expired |
| US5034165A | Air stone | Performing Operations; Transporting | 16 | Expired |
| US4894151A | Filter cartridge for an undergravel aquarium filter | Human Necessities | 15 | Expired |
| US4895646A | External aquarium filter | Human Necessities | 14 | Expired |
| US4861468A | Rotor impeller assembly | Electricity | 13 | Expired |
| US4975562A | Heater and thermostat unit | Electricity | 12 | Expired |
| US4842726A | Inside filter for aquariums | Human Necessities | 8 | Expired |
| US4907772A | Universal clamp for aquarium tank | Human Necessities | 7 | Expired |
| USD307626S | Aquarium filter cartridge | General | 6 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.