Tobacco smoke filters

Details Tobacco smoke filters Tobacco smoke filters

A - Human Necessities

24

D

131/17

A24D 3/00 (2006.01) A24D 3/04 (2006.01)

Patent

CA 1235037

-14- "Improvements Relating to Tobacco Smoke Filters" A B S T R A C T Cigarette filters comprise a filter element, open for smoke flow at the mouth end, and smoke passage means of flow impedance less than that of the filter element. The passage means is closed at the downstream end so that smoke is constrained to pass into the element at the downstream end of the passage means. The passage means may be an annular cross-section duct or grooves at the periphery of the element or may be a bore within the element. The filters provide an increasing degree of filtration as smoking proceeds.

494020

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