Filter

Details Filter Filter

2006-05-09

2006-05-09

Walker, W. L. (Department: 1723)

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

C210S350000, C210S356000

Reexamination Certificate

active

07040490

ABSTRACT:
A filter having filter openings, which openings vary in cross-section automatically in accordance with an inherent variable of the medium passing there through. The openings can vary in response to the heat of the medium passing through the openings. The openings can include a perforated plate screening the openings and having elements, which shift the plate relative to the openings. The elements can be springs and can include a shape memory alloy.

REFERENCES:
patent: 4783271 (1988-11-01), Silverwater
patent: 5554284 (1996-09-01), Bartelt et al.
patent: 5904163 (1999-05-01), Inoue et al.

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