Fleetguard, Inc.

Nelson Industries, Inc.

Jason E Dorgan

Kent Jeffrey Kallsen

Jeffrey S Morgan

Stephen L Fallon

Tadeusz Jaroszczyk

Z Gerald Liu

Larry T Gunderson

James Alan Debilzen

Brad Henke

Christopher E Holm

Eric A Janikowski

Jerald J Moy

Kelly R Schmitz

Byron Andrew Pardue

Thomas P Sonsalla

A direct flow filter includes a pleated filter element filtering fluid flowing axially therethrough parallel to the wall segment pleat tip bend lines. Embossments on the wall segments have a height extending along a lateral direction into a respective flow channel to maintain channel width and guiding and directing fluid axially into and along the flow channels from the upstream ends of the wall segments.

High capacity direct flow filter with maintained channel width

A high performance, high efficiency filter is provided by a multi-stage filter having combinations of tribologically different fibers, nanofibers, and layering.

High performance, high efficiency filter

A filter filters fluid flowing along an axial flow direction and includes a plurality of concentric cylindrical pleated filter elements having a common axis. A plurality of annular radial gaps between filter elements provide additional flow axially through the filter, providing equalized flow and reducing restriction. In further embodiments, a central filter element is concentrically surrounded by a cylindrical pleated outer filter element and provides additional flow axially therethrough.

Multi-element cylindrical filter with equalized flow

A filter ( ) filters fluid flowing along an axial flow direction ( ) and includes a plurality of panels ( ) of pleated filter elements ( ), each filter element having a plurality of pleats defined by wall segments ( ) extending along a transverse direction ( ) between first and second sets of pleat tips at first and second sets of axially extending bend lines ( ), the transverse direction ( ) being perpendicular to the axial direction ( ). Each of the panels ( ) extends along a lateral direction ( ) perpendicular to the axial direction ( ) and perpendicular to the transverse direction ( ). The wall segments ( ) extend axially between upstream and downstream ends ( ), and define axial flow channels ( ) therebetween which are alternately sealed at the upstream and downstream ends. Transverse gaps ( ) are provided between panels and the housing at upstream and downstream ends ( ), providing additional fluid flow axially therethrough and equalized contaminant passages.

Multi-panel fluid filter with equalized contaminant passages

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Madison, WI, United States of America

Jason E Dorgan