Tobacco smoke filters

Details Tobacco smoke filters Tobacco smoke filters

1983-02-07

1985-07-09

Millin, V.

Tobacco

Smoke separator or treater

By adding constituent to smoke stream

131338, 131339, 131340, A24D 304

Patent

active

045275726

ABSTRACT:
A filter for a smoking article such as a cigarette, comprising several grooves of varying depth between a shallow inlet end and a deep outlet end thereof, the outlet end face being air permeable to an extent greater than are the floor or the sides of each groove. A tipping enwrapping the filter plug has ventilation perforations in the region of the inlet end of each groove.
Alternatively, the grooves may have their median axes in a plane which is perpendicular to the axis of the filter plug, whereby the grooves extend circumferentially of the filter plug between the shallow inlet ends and the deep outlet ends.

REFERENCES:
patent: 4135523 (1979-01-01), Luke et al.
patent: 4273141 (1981-06-01), Tilburg

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