Composite filter and method of making the same
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United States of America Patent
Stats
-
Aug 22, 2006
Grant Date -
May 6, 2004
app pub date -
Mar 1, 2002
filing date -
Mar 2, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
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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