Issued Patents All Time
Showing 26–50 of 54 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4783258 | Filter cartridge with reuseable framework | Klaus Woltmann | 1988-11-08 |
| 4761227 | Self priming aquarium filter | Klaus Woltmann | 1988-08-02 |
| 4753723 | Inside filter for aquariums | — | 1988-06-28 |
| 4735715 | Power unit for aquarium filter assembly | — | 1988-04-05 |
| D294172 | Aquarium power filter | — | 1988-02-09 |
| 4714547 | Aquarium tubules | — | 1987-12-22 |
| 4699829 | Biological filtration plants | — | 1987-10-13 |
| D291722 | Aquarium filter cartridge frame | — | 1987-09-01 |
| D291720 | Aquarium filter pump | Monte L. Levin | 1987-09-01 |
| D291721 | Aquarium filter cartridge | — | 1987-09-01 |
| D289914 | Filter housing for aquariums | Monte L. Levin | 1987-05-19 |
| 4622148 | Aquarium filter system | — | 1986-11-11 |
| 4602996 | Aquarium filter assembly | — | 1986-07-29 |
| 4589982 | Removable power pack pump assembly | — | 1986-05-20 |
| D280658 | Aquarium filter | — | 1985-09-17 |
| 4532037 | Aquarium aerating device | — | 1985-07-30 |
| 4512885 | Aquarium filter assembly | — | 1985-04-23 |
| D273409 | Combined aquarium fishnet and support | — | 1984-04-10 |
| 4392570 | Aquarium net assembly and packaging therefore | — | 1983-07-12 |
| D269633 | Check valve | Tsuyoshi Itakura | 1983-07-05 |
| 4369216 | Artificial aquarium plant | — | 1983-01-18 |
| 4340625 | Artificial aquarium plant | — | 1982-07-20 |
| 4315143 | Aquarium heater | Tsuyoshi Itakura | 1982-02-09 |
| 4301767 | Holding clamp for an aquarium heater | Tsuyoshi Itakura | 1981-11-24 |
| 4265751 | External biological aquarium filter | — | 1981-05-05 |