Nelson Industries, Inc.

Douglas K Benham

Z Gerald Liu

Michael J Connor

Scott P Heckel

Jeffrey S Morgan

Stephen L Fallon

Tadeusz Jaroszczyk

A filter ( ) includes a housing ( ) extending along an axis ( ). and having an inlet ( ) at one axial end ( ) of the housing and having an outlet ( ) at a distally opposite axial end ( ) of the housing. One or more pleated filter elements ( ) in the housing are pleated along a plurality of bend lines ( ) extending axially. The filter element has a plurality of wall segments ( ) extending in serpentine manner between the bend lines. The wall segments extend axially between upstream ends ( ) and downstream ends ( ) and define axial flow channels ( ) therebetween. The upstream ends of the wall segments are alternately sealed ( ) to each other to defme a first set of flow channels ( ) having open upstream ends ( ), and a second set of flow channels ( ) interdigitated with the first set of flow channels and having closed upstream ends ( ). The downstream ends of the wall segments are alternately sealed to each other ( ) such that the first set of flow channels have closed downstream ends ( ), and the second set of flow channels have open downstream ends ( ). Fluid to be filtered flows substantially directly axially through the filter element ( ) or elements ( ), through the open upstream ends of the first set of flow channels then through the wall segments then through the open downstream ends of the second set of flow channels. A gasket ( ) seals the filter element to the housing.

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Stoughton, WI, United States of America

Douglas K Benham