Patent ID: 9457307
Filing Date: 2016-10-04
CPC Classification: B01D,F02M,Y10T

Claim Text:
1. A filter system comprising: a housing with a housing wall and a cover; an inlet arranged on the housing and adapted to feed a fluid to be filtered into the housing; an outlet arranged on the housing and adapted to discharge the filtered fluid; one or more filter elements arranged in the housing, wherein the filter elements each comprise at least one filter medium, wherein at least one of the filter elements extends along a longitudinal axis; wherein the filter medium is pleated in a zigzag shape and has a first side and a second side opposite the first side, wherein the filter medium comprises pleats extending in a direction of the longitudinal axis, wherein the pleats comprise outer pleat edges and inner pleat edges, wherein the outer pleat edges are positioned on the first side of the filter medium and wherein the inner pleat edges are positioned on the second side of the filter medium and are positioned opposite the outer pleat edges; wherein the filter medium has a variable flow resistance along the longitudinal axis, wherein a first one and a second one of the filter elements are provided and wherein said first one of the filter elements is arranged in an interior of said second one of the filter elements.