Brown & Williamson Tobacco Corporation

Martin L Reynolds

Tilford F Riehl

Dorothy M Frank

Robert R Johnson

Andrew McMurtrie

A filter for a cigarette includes a porous filter rod having a capillary smoke passageway extending coaxially therethrough. The filter rod is circumscribed by a non-porous wrapper and the filter rod with the non-porous wrapper therearound is provided with at least one groove extending from one end thereof a preselected distance longitudinally therealong. The groove preferably extends from the mouth end of the filter rod. Tipping material circumscribes the non-porous wrapper and is provided with flow-through openings therein in flow communication with the groove. In one embodiment, the filter rod includes a cylindrical collar coaxially located at the mouth end defining a recess, the thickness of the wall of the collar being less than the depth of the groove. In a further embodiment, the filter collar includes a concentric open core member coaxial with and open to the capillary flow passageway with the area between the core member and collar wall being open to the groove. In a still further embodiment, the filter rod includes a cylindrical filter collar located at the mouth end defining a recess, the filter collar covering the open end of the groove at the mouth end of the filter rod.

Cigarette filter

A filter for a cigarette includes a porous filter rod circumscribed by a non-porous wrapper provided with at least one groove embedded into the periphery of the filter rod extending from the mouth end thereof a preselected distance longitudinally therealong less than the entire length of the filter rod. Tipping material circumscribes the non-porous wrapper and is provided with flow-through openings therein in flow communication with the groove. The tipping material extends beyond the mouth end thereof defining a recess, and the filter rod includes a cylindrical collar coaxially located in the recess concentrically with the portion of the tipping material extending beyond the filter rod mouth end. The thickness of the wall of the collar is less than the depth of the groove which collar functions as a baffle to accelerate the velocity of the air leaving the groove.

A filter for a cigarette includes a porous filter rod circumscribed by a non-porous wrapper wherein the filter rod with the non-porous wrapper therearound is provided with grooves extending from one end thereof a preselected distance longitudinally therealong. The grooves are open to the atmosphere and may be oriented to extend to the mouth end of the filter when connected to a cigarette, to the tobacco end of the filter when connected to the cigarette, or non-connecting grooves which extend from each end of the filter element a preselected distance therealong.

Growing community of inventors

Louisville, KY, United States of America

Martin L Reynolds