Liquid filtration media
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United States of America Patent
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Aug 9, 2011
Grant Date -
Jan 29, 2009
app pub date -
Sep 18, 2008
filing date -
Mar 6, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A liquid filter with a composite medium that has a nanoweb adjacent to and optionally bonded to a microporous membrane. The membrane is characterized by an LRV value of 3.7 at a rated particle size, and the nanoweb has a fractional filtration efficiency of greater than 0.1 at the rated particle size of the membrane. The nanoweb also has a thickness efficiency ratio of greater than 0.0002 at that efficiency. The nanoweb acts to provide depth filtration to the membrane, prefilters particles and extends the lifetime of the membrane.
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