Composite filter medium and fluid filters containing same
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United States of America Patent
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app pub date -
Aug 23, 2004
filing date -
Aug 27, 1998
priority date (Note) -
Abandoned
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Abstract
A composite filter medium for removing at least 99.95 percent of particulates of a size in the 3 to 4 micron range and dissolved chemical contaminants from a fluid and filters of various configurations employing the composite filter medium are disclosed. The composite filter medium comprises an adsorbent layer containing an adsorbent agent and a hydrophilic particulate intercepting layer disposed adjacent to the adsorbent layer. The composite medium has a mean flow pore diameter of about 1 to 10 microns, a bubble point of about 3 to 15 microns and an air permeability of about 0.5 to 7 liters per minute/cm.sup.2 with a pressure drop of about 0.1 bar.
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