Method of filtering in an aquarium tank with a filter envelope
US4880549A · kind A · utility
22Cited by
10References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1988 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Aug 17, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01K63/045
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A filter cartridge comprising a framework and a surrounding envelope of filter material. The framework is reusable and provided with a rough, granular surface texture to provide increase surface area available for the propagation of aerobic bacteria. The envelope is disposable. Thus, biological filtration of the water provided by the aerobic bacteria is not interrupted upon replacement of the filter material. A second filter medium may be disposed within the envelope. The envelope is held in place by a pair of flaps which sandwich an edge of the filter material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.