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 1197431

UNITED STATES PATENT APPLICATION of Donald Silberstein and Andrew McMurtrie for CIGARETTE FILTER ABSTRACT OF THE DISCLOSURE A filter for a cigarette includes a porous filter rod circumscribed by a non-porous or air impermeable wrapper, and ventilating air grooves embedded in the wrapped filter rod which extend from one end of the filter rod a preselected distance generally longitudinally thereof. The end of the grooves are recessed a predetermined distance or depth inwardly of the end of the filter rod and communicate with radially extending open channels formed in the one end of the filter rod. An air permeable tipping material circumscribes the wrapped filter rod which provides a path for ventilating air flow into the grooves. Due the the air impermeable wrapper, the air flowing in the grooves is segregated from the smoke flowing through the filter rod so that ventilating air is the only substance flowing in the grooves.

424208

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