Gradient density filter

Details Gradient density filter Gradient density filter

1995-02-01

1995-12-05

Spear, Frank

Liquid purification or separation

Diverse distinct separators

Including a filter

210488, B01D 2500

Patent

active

054726000

ABSTRACT:
A gradient density filter made from sheets of blown polypropylene microfibers where the microfibers of at least one of the sheets have an effective fiber diameter less than that of the other sheets is described. This filter is especially useful in solid phase extraction processes, particularly those where biological fluids are being analyzed.

REFERENCES:
patent: 956832 (1910-03-01), Seitz
patent: 3353682 (1967-11-01), Pall et al.
patent: 3847821 (1974-11-01), Krueger
patent: 4701267 (1987-10-01), Watanabe et al.
patent: 4925572 (1990-05-01), Pall
patent: 5279742 (1994-01-01), Markell et al.
patent: 5338448 (1994-08-01), Gjerde
V. A. Wente, "Superfine Thermoplastic Fibers," Industrial and Engineering Chemistry, vol. 48, No. 8, 1342-46 (Aug. 1956).
V. A. Wente et al., "Manufacture of Superfine Organic Fibers," Naval Research Laboratory Report 4364 (May 25, 1954).
C. Y. Chen, "Filtration of Aerosols by Fibrous Media," Chemical Reviews, 55, 595-623 (1955).

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