Sample filtration device

Details Sample filtration device Sample filtration device

1988-01-25

1990-01-02

Fisher, Richard V.

Liquid purification or separation

Filter

Movable medium

210518, 422101, B01D 3300

Patent

active

048911348

ABSTRACT:
The present invention relates to a sample filtration device of the type employing differential pressure. An outer container filled with a sample to be filtered slidably receives a hollow plunger having filter media disposed near one end and sealing means disposed in an annular groove about the periphery of the plunger. The annular groove of the plunger is formed by two components: an annular shoulder on a collector portion and the axial face of an annular ring formed in a retainer portion. The two portions are frictionally engaged to retain the filter in place and form the annular groove for the sealing means. This construction permits straight-pull molding of the component parts which eliminates mold mismatch flaws.

REFERENCES:
patent: 3325576 (1967-06-01), Kessler
patent: 3481477 (1969-12-01), Farr
patent: 3512940 (1970-05-01), Shapiro
patent: 3693804 (1972-09-01), Grover
patent: 3969250 (1976-07-01), Farr
patent: 3970565 (1976-07-01), Ahlstrand et al.
patent: 4035150 (1977-07-01), Jaffe
patent: 4286640 (1981-09-01), Knox et al.
patent: 4454231 (1984-06-01), Cais et al.
patent: 4456690 (1984-06-01), Cais et al.
patent: 4568083 (1986-02-01), Miller
patent: 4800020 (1989-01-01), Savas et al.

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