Patent ID: 8746462

Claim:
A filter for filtering a liquid or gaseous fluid comprising: a filter element ( 1 ) with a zigzag-folded filter medium ( 14 ; 106 ) including a raw side ( 105 ); and a clean side ( 104 ); a plurality of filter medium sections ( 120 ) joined to neighboring filter medium sections ( 120 ) along fold tips ( 102 a ) or fold bases ( 103 a ), said plurality of filter medium sections ( 120 ) extending on both said raw and clean sides from raw-side fold tips ( 102 a ) to neighboring raw-side fold bases ( 103 a ), viewed from said raw-side fold tips ( 102 a ), respectively; wherein at said raw side ( 105 ) a plurality of elongated depressions ( 656 ) are formed in said filter medium ( 14 ; 106 ), the depressions having a length in an elongation direction and a width in a direction perpendicular to the elongation direction, the depression length extends between raw-side fold tips ( 102 a ) and raw-side fold bases ( 103 a ) approximately perpendicularly to fold edges (F) of said filter medium ( 14 ; 106 ) and realize at said clean side ( 104 ) corresponding projections ( 658 ) in such a way that in a raw-side intermediate fold space ( 148 a ) two depressions ( 656 ), respectively, are positioned directly opposite each other on said two medium sections ( 120 ) delimiting an intermediate fold space ( 148 a ) and each form partially a flow passage ( 660 ); wherein at a center of a width of at least one of said depressions ( 656 ) a support ( 662 ) is formed as a further depression into said at least one of said depressions of said filter media, said support which extends in the elongation direction on the center of the depression ( 656 ), the corresponding projection ( 658 ) and at the raw side ( 105 ) forms a recess and at the clean side ( 104 ) a raised portion; wherein at the clean side the raised portion of the support ( 662 ) projects outwardly away from the projection ( 658 ) in the direction of the clean side ( 104 ), the support having a width less than the width of the projection ( 658 ); wherein the support ( 662 ) on a first one of said filter medium sections ( 120 ) rests directly against and lies directly upon a corresponding support ( 662 ) on an adjacent one of said filter medium sections ( 120 ).