Filter assembly and cartridge therefor
US4385989A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 16, 1981 |
| Grant date | May 31, 1983 |
| Priority date | — |
| Expiry date | Sep 16, 2001 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01K63/045
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A novel filter assembly (10) and filter cartridge (12) therefor for use in an under-gravel filtration system in an aquarium tank (24). The filter assembly (10) includes an airlift tube (14), a filter cartridge (12) removably secured to the upper end of the airlift tube (14), and a tubular member (16) extending through the filter cartridge (12) and into the airlift tube (14). An aerator (18) disposed near the bottom of the airlift tube (14) is connected to the tubular member (16) by air tubing (19, 20). The top and bottom walls (48, 50) of the filter cartridge (12) are apertured (56, 58). When air is forced down the tubular member (16) and out the aerator (18), the rising air bubbles in the airlift tube (14) draw water up the airlift tube (14) and into the filter cartridge (12) through the openings (58) in the bottom wall (50), the water being returned to the aquarium tank (24) through the openings (56) in the top wall (48).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.