Liquid purification or separation – Filter – Material
Patent
1989-02-02
1990-02-20
Sever, Frank
Liquid purification or separation
Filter
Material
55528, 210507, B01D 1300, B01D 2908
Patent
active
049024230
ABSTRACT:
A thin, low density porous polytetrafluoroethylene membrane having very large pores and heretofore unknown high air permeabilities is described. The membrane is produced by a particular series of longitudinal and transverse stretching steps carried out under particular conditions.
REFERENCES:
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patent: 4248924 (1981-02-01), Okita
patent: 4482516 (1984-11-01), Bowman et al.
patent: 4598011 (1986-07-01), Bowman
patent: 4814412 (1989-03-01), Crowther
Samuels Gary A.
Sever Frank
W. L. Gore & Associates, Inc.
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