Depth filter media

Details Depth filter media Depth filter media

1991-09-09

1994-01-18

Dawson, Robert A.

Liquid purification or separation

With repair or assembling means

210484, 210489, 2104935, 2104941, 210496, 2104972, 55500, 55521, 55527, 55DIG5, B01D 2706

Patent

active

052797317

ABSTRACT:
A porous filter medium is formed by a pleated cylinder of a depth filter medium. An absolute rated inner filtration layer is arranged between upstream and downstream drainage layers. The depth filter medium is formed from a continuous sleeve. Additionally or alternatively at least the downstream drainage layer may be formed integrally with at least a part of an inner filtration layer. The material of the medium may be a fibrous mass of non-woven synthetic polymeric micro-fibers which are free of fiber-to-fiber bonding and are secured to each other by mechanical entanglement or intertwining, with the diameter of the fibrous structure varying across the medium.

REFERENCES:
patent: 4032688 (1977-06-01), Pall
patent: 4089783 (1978-05-01), Holyoak
patent: 4104170 (1978-08-01), Nedza
patent: 4233042 (1980-11-01), Tao
patent: 4539107 (1985-09-01), Ayers
patent: 4594162 (1986-06-01), Berger
patent: 4693985 (1987-09-01), Degen et al.
patent: 4878929 (1989-11-01), Tofsland et al.
patent: 5084178 (1992-01-01), Miller et al.

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