Filter for liquid and method of filtering liquid

Details Filter for liquid and method of filtering liquid Filter for liquid and method of filtering liquid

1988-12-22

1990-08-14

Jones, W. Gary

Liquid purification or separation

Processes

Utilizing electrical or wave energy directly applied to...

210243, 210491, 204186, 204188, B01D 1706

Patent

active

049485156

ABSTRACT:
A method for filtering liquids having a dielectric constant less than 10 is disclosed. The method includes the step of filtering a liquid through a porous layer of an electret, the electret consisting of a fibrous sheet having a surface charge density of at least 5.times.10.sup.-11 coulombs/cm.sup.2, wherein on the upstream side of the electret is laminated another porous layer having at least a porosity or an average fiber diameter greater than that of the electret layer. The upstream layer may consist of either a fibrous electret layer, or an uncharged fibrous layer.

REFERENCES:
patent: 4323374 (1982-04-01), Shinagawa et al.
patent: 4375718 (1983-03-01), Wadsworth et al.
patent: 4579637 (1986-04-01), Jaisinghani et al.

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