Product and method of forming successive layers of...

Details Product and method of forming successive layers of... Product and method of forming successive layers of...

2004-12-07

2008-07-15

Cecil, Terry K (Department: 1797)

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

C210S496000, C210S508000, C055S487000

Reexamination Certificate

active

07398887

ABSTRACT:
A filter media product and method of making the same wherein at least two independent filter media thicknesses of differing coarse and fine pore sizes are held in face-to-face relationship with the pore sizes being so calculated that the overall average pore size of successive thicknesses is smaller than the pore size of the finest fiber thickness.

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patent: 4322385 (1982-03-01), Goetz
patent: 4589983 (1986-05-01), Wydevan
patent: 4661255 (1987-04-01), Aumann et al.
patent: 4732675 (1988-03-01), Badolato et al.
patent: 5082476 (1992-01-01), Kahlbaugh et al.
patent: 5275743 (1994-01-01), Miller et al.
patent: 5480464 (1996-01-01), De Villiers et al.
patent: 5800586 (1998-09-01), Cusick et al.
patent: 5858045 (1999-01-01), Stemmer et al.
patent: 5968373 (1999-10-01), Choi
“Air Permeability and Pore Distribution of a Dual-Layered Microglass Filter Medium”, vol. 6 of Advances in filtration and Separation Technology of the AFS Society 97-99 (1994).

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