Smoking articles

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A - Human Necessities

24

D

131/12

A24D 1/00 (2006.01) A24D 3/04 (2006.01)

Patent

CA 1231610

-14- "Improvements Relating to Smoking Articles" A B S T R A C T A smoking article mouthpiece comprises a smoke passage and a ventilation air duct, both of which extend from end-to-end of the mouthpiece. The duct is of a depth of 25% or more of the diameter of the mouthpiece. When the mouthpiece is incorporated in a smoking article such that air may enter the duct, the ratio of the velocities of air and smoke is in excess of ten. The mouthpiece may also comprise a ventilation-air collection groove which extends about the element and opens into the ventilation air duct.

491419

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