Patent ID: 8016123

Claim:
A filter element comprising: a first filter layer comprising an active carbon layer of active carbon particles, a top cover layer connected to the active carbon layer and a bottom cover layer connected to the active carbon layer opposite the top cover layer, wherein the first filter layer is folded to a first bellows; at least one second filter layer comprising an active carbon layer of active carbon particles, a top cover layer connected to the active carbon layer and a bottom cover layer connected to the active carbon layer opposite the top cover layer, wherein the at least one second filter layer is folded to a second bellows, wherein the first and second bellows are folded identically; wherein the at least one second filter layer is arranged on the first filter layer in a positive-locking way by fold alignment of the first and second bellows to form a composite of filter layers, wherein only an uppermost one of the top and bottom cover layers of the composite of filter layers is provided with a filter medium, and wherein the filter medium is filter paper.