Filter cartridge
US5053125A · kind A · utility
35Cited by
9References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1989 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | Dec 7, 2009 |
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.