Gradient density filter medium

Details Gradient density filter medium Gradient density filter medium

1988-01-15

1988-12-27

Fisher, Richard V.

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

210496, 210505, 55487, B01D 3914

Patent

active

047939230

ABSTRACT:
A filter medium for filtration of a fluid to flow therethrough from an upstream side to a downstream side thereof, said filter medium comprising a substrate having a density gradient wherein the density is high on the upstream side and low on the downstream side of the substrate.

REFERENCES:
patent: 3690852 (1972-09-01), Smith et al.
patent: 3815341 (1974-06-01), Hamano
patent: 4073732 (1978-02-01), Lauer et al.
patent: 4093437 (1978-06-01), Ichihara et al.
patent: 4111815 (1978-09-01), Walker et al.
patent: 4257791 (1981-03-01), Wald
patent: 4522876 (1985-06-01), Hiers
patent: 4528008 (1985-07-01), Takagi et al.
patent: 4619674 (1986-10-01), Erdmannsdorfer

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