Patent ID: 7393269

Claim:
An abrasive filter assembly comprising: a porous element comprising a first surface, a second surface opposite said first surface, and a plurality of openings extending from said first surface to said second surface of said porous element; a first filter media having a first surface and a second surface opposite said first surface, said first surface of said first filter media proximate said second surface of said porous element, said first filter media comprising a plurality of discrete channels formed by a plurality of channel sidewalls, said channels extending from said first surface of said first filter media to said second surface of said first filter media, a second filter media having a first surface and a second surface opposite said first surface, said first surface of said second filter media proximate said second surface of said first filter media; an attachment interface layer proximate said second surface of said second filter media; and at least one cavity located between said first surface of said first filter media and said attachment interface layer, said cavity comprises an open area of at least 1 square centimeter; wherein said openings cooperate with said channels and said cavity to allow the flow of particles from said first surface of said porous element to said second filter media.