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.
Claims31
A low flow resistance composite filter medium for removing at least 99.95 percent of particulates at a size in the 3 to 4 micron range and dissolved chemical contaminants from a fluid, the composite filter medium comprising:
- an adsorbent layer containing at least one adsorbent agent;
- a hydrophilic particulate intercepting layer disposed adjacent to the adsorbent layer;
- and
- wherein the composite filter 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.
A filter for removing 99.95 percent of particulates of a size in the 3 to 4 micron range and dissolved chemical contaminants from fluid, the filter comprising:
- a rim defining a filtration area within the rim;
- a sheet-like composite filter medium disposed within the filtration area of the rim and having edges sealably affixed to the rim, wherein the sheet-like composite filter medium further comprises:
- an adsorbent layer containing an adsorbent agent;
- a hydrophilic particulate intercepting layer disposed adjacent to the adsorbent layer;
- and
- wherein the composite filter 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;
- and
- at least one support member extending from the rim into the filtration area.
A cylindrical pleated filter for removing 99.95 percent of particulates of a size in the 3 to 4 micron range and dissolved chemical contaminants from a fluid, the filter comprising:
- a base having an outlet opening therein;
- a top;
- a fluid permeable tube extending from the base to the top, the tube having an end engaged with the outlet opening in the base;
- a sheet-like composite filter medium sealably disposed in a generally cylindrical configuration about the porous tube between the base and top, the medium further having a plurality of outer radial pleats extending from the base to the top and a plurality of inner radial pleats adjacent to the tube, the outer and inner radial pleats defining a plurality of filtration panels, and wherein the composite filter medium further comprises:
- an adsorbent layer containing an adsorbent agent;
- a hydrophilic particulate intercepting layer disposed adjacent to the adsorbent layer;
- and
- wherein the 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
A spiral wound filter for removing 99.95 percent of particulates of a size in the 3 to 4 micron range and dissolved chemical contaminants from a fluid, the filter comprising:
- a top having a plurality of perforations therein;
- a bottom having a plurality of perforations therein;
- a support tube extending from the top to the bottom;
- a sheet-like composite filter medium having a top edge adjacent to the top and a bottom edge adjacent to the bottom and being spirally wound around the support tube, wherein the composite filter medium further comprises:
- an adsorbent layer containing an adsorbent agent;
- a hydrophilic particulate intercepting layer disposed adjacent to the adsorbent layer;
- and
- wherein the 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.
A pleated panel filter for removing 99.95 percent of particulates of a size in the 3 to 4 micron range and dissolved chemical contaminants from a fluid, the filter comprising:
- an outlet end panel having an opening therein;
- a sheet-like composite filter medium capable of sealably covering the opening of the outlet end panel, wherein the sheet-like composite filter medium is pleated so as to have a first outward pleat located remotely from the outlet end panel, an inward pleat located closely to the outlet end panel, and a second outward pleat located remotely from the outlet end panel, wherein the pleats define four filter medium panels comprising a first panel extending between the outlet end panel and the first outward pleat, a panel extending from the first outward pleat to the inward pleat, a third panel extending from the inward pleat to the second outward pleat and a fourth panel extending from the second outward pleat to the outlet end panel, wherein the composite filter medium further comprises:
- an adsorbent layer containing an adsorbent agent;
- a hydrophilic particulate intercepting layer disposed adjacent to the adsorbent layer;
- and
- wherein the 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.
Dependencies are inferred from the claim text.