Patent ID: 8449642
Filing Date: 2013-05-28
Classification: B01D,F01N,Y02T

Abstract:
1. A filter medium having an inflow side and an outflow side defining a flow direction, said filter medium comprising: at least n consecutive layers Lx of fiber media, x varying from 1 to n, n being more than or equal to 2, L wherein for all layers Lx of the at least n consecutive layers, the ratio Hx/(kx*Ax) is identical within measurement tolerances, wherein Hx is the average thickness of the layer Lx in flow direction, Ax is the average surface area of cross sections according to planes perpendicular to the flow direction, and kx is the permeability coefficient of this layer Lx, wherein Hx varies for each of the Lx layers, and wherein the fiber media of at least part of the layers of the filter medium comprises metal fibers.