Smoking article with concentric filter
AssigneePhilip Morris Products S.A.
InventorsHelene Blangy, Nadine Lacroix Oggier
Life of this patent
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Abstract
A smoking article (10) incorporates a tobacco rob (12) and a filter attached to the tobacco rod. The filter includes a concentric filter segment (20) having a central core portion (23) with sorbent material and an outer periphery layer (24) circumscribed about the central core portion. At least about 80 weight % of the sorbent in the smoking article is disposed in the central core portion. The central core portion has a lower RTD than the periphery layer. A ventilation zone (30) is disposed adjacent an upstream end of the concentric sorbent segment.
Claims20
A smoking article comprising:
- a tobacco rod;
- a filter attached to the tobacco rod, the filter comprising;
- a concentric sorbent segment including a central core portion comprising sorbent material and an outer periphery layer circumscribed about the central core portion, the central core portion having a lower resistance to draw than the periphery layer, at least about 80 weight % of the sorbent in the smoking article is disposed in the central core portion;
- and
- a ventilation zone disposed adjacent an upstream end of the concentric sorbent segment.
A smoking article comprising:
- a tobacco rod;
- a filter attached to the tobacco rod, the filter comprising;
- a concentric sorbent segment including a central core portion comprising sorbent material and an outer periphery layer circumscribed about the central core portion, the central core portion having a resistance to draw that is about 75% or less of a resistance to draw of the periphery layer, at least about 80 weight % of the sorbent in the smoking article is disposed in the central core portion;
- a second filter segment axially aligned with and between the tobacco rod and the concentric sorbent segment and the ventilation is disposed along a length of the second filter segment;
- and
- a ventilation zone disposed along a length of the second filter segment.
Dependencies are inferred from the claim text.