Gas born particulate filter and method of making
AssigneeKimberly-Clark Worldwide, Inc.
InventorBernard Cohen
Life of this patent
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Abstract
Disclosed is an improved filter formed from a non-dielectric material which has been coated with a dielectric material and electret treated by, for example, DC corona discharge treatment. Also disclosed is a method for the formation of the filter.
Claims16
A filter adapted to remove particulate material from a gaseous material passing through the filter, the filter comprising:
- a porous sheet of a non-dielectric material coated with a dielectric material, and
- wherein the coated sheet has been electret treated to establish a charge on the dielectric material.
A method for improving the filtration efficiency of a porous filter material formed from a non-dielectric material, the improvement comprising the steps of:
- coating the porous, non-dielectric filter material with a dielectric material, and
- electret treating the coated filter material to establish a charge on the dielectric material.
A filter adapted to remove particulate material from a gaseous material passing through the filter, the filter comprising:
- a porous sheet of a non-dielectric material coated with a dielectric material, and
- wherein the coated sheet has been subjected to a DC corona discharge treatment to establish a charge on the dielectric material.
Dependencies are inferred from the claim text.