Tobacco smoke filters

Details Tobacco smoke filters Tobacco smoke filters

1985-10-24

1987-04-28

Millin, V.

Tobacco

Smoke separator or treater

Interior surface causes particular flow characteristic

131340, A24D 304

Patent

active

046605797

ABSTRACT:
Cigarette filters comprises a filter element, open for smoke flow at the mouth end, and smoke passage of flow impedance less than that of the filter element. The passage is closed at the downstream end so that smoke is constrained to pass into the element at the downstream end of the passage. The passage 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.

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