Cigarette filter

Details Cigarette filter Cigarette filter

A - Human Necessities

24

D

131/21

A24D 3/00 (2006.01) A24D 3/04 (2006.01)

Patent

CA 1245532

UNITED STATES PATENT APPLICATION OF R. A. GONTERMAN FOR CIGARETTE FILTER ABSTRACT OF THE DISCLOSURE A filter for a cigarette includes a porous filter rod circumscribed by an air impermeable wrapper and ventilation grooves embedded in the wrapped filter rod which extend from one end of the filter rod a preselected distance generally longitudinally thereof. A plurality of ventilation air flow apertures are formed through the wrapper. Some of the air flow apertures are located in the grooves and others of the air flow apertures are formed in the area of the wrapper outside of the grooves. An air impermeable tipping material circumscribes the wrapped filter rod. The tipping material is formed with a plurality of ventilation air flow apertures therethrough such that each ventilation air flow aperture through the tipping material is in substantial registration with a different one of the ventilation air flow apertures formed through the wrapper. In addition, a process for making the above described filter includes the steps of forming a generally cylindrical filter rod of porous material; wrapping the filter rod with an impermeable wrapper material, embedding a plurality of grooves in the wrapped filter rod extending from one end of the filter a preselected distance generally longitudinally of the filter rod; circumscribing the grooved filter rod with an impermeable tipping material; and cutting a plurality of ventilation air flow apertures through the tipping paper and underlaying wrapper material.

501033

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