Composite filter and method of making the same

Details Composite filter and method of making the same Composite filter and method of making the same

2006-08-22

2006-08-22

Pham, Minh-Chau T. (Department: 1724)

Gas separation

Two or more separators

Plies or layers of different characteristics or orientation

C055S485000, C055S487000, C055SDIG020, C055S382000, C055S528000, C015S347000, C015S352000, C095S057000, C095S287000, C096S066000, C096S069000, C428S340000, C428S903000, C442S389000

Reexamination Certificate

active

07094270

ABSTRACT:
The invention refers to a composite filter for filtering a stream of ambient air including at least one non-prebonded upstream tier and one non-prebonded downstream tier, wherein the ratio of absolute pore volume of upstream tier to downstream tier RAPV>2, and the absolute projected fiber coverage of upstream tier and of downstream tier APFC>95%. Further, the invention refers to a method of making such a composite filter including the steps of (a) laying down a filtration material onto a support to form the upstream non-prebonded tier, (b) depositing onto the upstream tier the downstream non-prebonded tier, and (c) bonding the tiers to form a composite filter having a unitary stratified structure.

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