Liquid purification or separation – Processes – Separating
Patent
1988-08-17
1989-11-14
Fisher, Richard V.
Liquid purification or separation
Processes
Separating
210169, 2104162, 119 5, B01D 3700
Patent
active
048805491
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.
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patent: 3288110 (1966-11-01), Goldman et al.
patent: 3477580 (1969-11-01), Willinger
patent: 3529574 (1970-09-01), Kelley
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patent: 4206719 (1980-06-01), Faris
patent: 4620924 (1986-11-01), Goldman et al.
Willinger Allan H.
Woltmann Klaus
Fisher Richard V.
Millard Wanda L.
Willinger Brothers, Inc.
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