Patent ID: 7588619

Claim:
A filter media for a fluid medium, the filter media comprising: a first sheet having an inner surface and an outer surface; a second sheet having an inner surface and an outer surface, wherein the inner surface of the first sheet and the inner surface of the second sheet at least in part define at least two fluid channels between the first sheet and the second sheet to define a filter media having a first axial end and a second axial end, wherein the at least two fluid channels extend between the first axial end and the second axial end, and wherein, interior to said axial ends, the first and second sheets define at least one opening between a first one of said at least two fluid channels and a second one of said at least two fluid channels such that fluid can uninterruptedly flow between the first one of said at least two fluid channels and the second one of the at least two fluid channels, and further wherein the at least two fluid channels and the at least one opening are defined at least in part by a surface characteristic of the first sheet and a surface characteristic of the second sheet, wherein the surface characteristic of the one or more facing surfaces of first sheet of material includes a corrugated surface having a series of peaks and valleys.