Composite filter medium and fluid filters containing same
AssigneeKoslow Technologies Corporation
InventorEvan E. Koslow
Life of this patent
Estimating the term…
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/cm2 with a pressure drop of about 0.1 bar.
Claims11
A filter medium comprising:
- a discrete adsorbent layer having a powdered mixture of a particulate adsorbing agent and a particulate binding agent coating a first supporting substrate, wherein said particulate binding agent interconnects said particulate adsorbent agent and fuses said powdered mixture to said first supporting substrate upon heating said powdered mixture to a t least a Vicat softening temperature of said particulate binding agent but below the melting temperature of said particulate adsorbing agent;
- and
- a discrete hydrophilic microparticulate intercepting layer disposed adjacent to said adsorbent layer having a second supporting substrate wherein a front surface of said second supporting substrate faces a back surface of said first supporting substrate,
- wherein said composite filter medium has a mean flow pore diameter of about 1 to 10 microns, a bubble point of about 3 to about 15 microns and an air permeability of about 0.5 to 7 liters per minute/cm2 with a pressure drop of about 0.1 bar.
A composite filter medium comprising:
- a layer having a powdered mixture of a particulate adsorbing agent and a particulate binding agent coating a first supporting substrate, wherein said particulate binding agent interconnects said particulate adsorbent agent and fuses said powdered mixture to said first supporting substrate upon heating said powdered mixture to a t least a Vicat softening temperature of said particulate binding agent but bellow the melting temperature of said particulate adsorbing agent;
- and
- a hydrophilic microparticulate intercepting layer comprising a hydrophilic melt blown microfiber medium,
- wherein said composite filter medium has a mean flow pore diameter of about 1 to 10 microns, a bubble point of about 3 to about 15 microns and an air permeability of about 0.5 to 7 liters per minute/cm2 with a pressure drop of about 0.1 bar.
Dependencies are inferred from the claim text.