Title: Cigarette filter

Abstract: A filter for a cigarette includes a porous filter rod circumscribed by a smoke impervious wrapper wherein the filter rod with the smoke impervious wrapper therearound is provided with grooves embedded therein and extending from one end thereof a preselected distance longitudinally therealong. Tipping material circumscribes the smoke impervious wrapper and is provided with flow-through openings therein in flow communication with the grooves. Support means are provided for the tipping material at the mouth end of the filter to maintain the tipping material in circumferential equalization.

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Inventors: Sanford, Robert A. (Prospect, KY)
Johnson, Robert R. (Louisville, KY)

Application Number: 06/213441
Filing Date: 1980-12-05
Publication_date: 1982-07-13
Assignee: BROWN & WILLIAMSON TOBACCO

Primary Class(es): 131/336 131/340, 131/365, 131/362, 131/361, 131/339
Other Classes: A24D3/04; A24D3/00; A24D3/04
US Patent Ref:

3490461	January, 1970	Osmalov et al.	131/336	CIGARETTE VENTILATION
3607512	September, 1971	Mathe	131/340	EXTRUDING TOW FILLED MOUTHPIECE ROD HAVING SERRATED INNER SURFACES CLENCHING THE TOW
3910288	October, 1975	Hammersmith et al.	131/340	Programmed filter

Other Refs:
Primary Examiner: Millin V.
Assistant Examiner:
Attorney: Lamb, Charles G.

Claims:

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