Abstract: A filtered cigarette including a forward portion, a strainer and a filter, in which the filter is of molded plastic, having one or a plurality of surfaces provided with interconnected channels which provide long and tortuous paths through which the air-smoke mixture passes.In one embodiment, the passageway of the filter is around the periphery of a hollow cylindrical core, covered by paper. This passageway comprises a plurality of circumferentially disposed axially spaced groover interconnected by axially extending connector channels. Islands or abutments at the discharge ends of certain air-smoke channels abruptly change the direction of flow of air-smoke mixture and separate it into separate streams which eventually are recombined.

Abstract: A filtered cigarette including a forward portion, a strainer and a filter, in which the filter is of molded plastic, having one or a plurality of surfaces provided with interconnected channels which provide long and tortuous paths through which the air-smoke mixture passes.In one embodiment, the passageway of the filter is around the periphery of a hollow cylindrical core, covered by paper. This passageway comprises a plurality of circumferentially disposed axially spaced grooves interconnected by axially extending connector channels. Islands or abutments at the discharge ends of certain air-smoke channels abruptly change the direction of flow of air-smoke mixture and separate it into separate streams which eventually are recombined.Another embodiment includes a flat wafer core inserted into a cylindrical housing which covers the transverse and longitudinal channels formed in both sides of the wafer.