Cigarette and filter therefor

Details Cigarette and filter therefor Cigarette and filter therefor

1990-04-12

1992-04-28

Millin, V.

Tobacco

Smoke separator or treater

Having means to vary smoke flow rate

131339, 131340, A24D 304

Patent

active

051078635

ABSTRACT:
A cigarette filter 12 comprises a rod of filter material having an inner zone 16 of 60% to 90% filter efficiency and an outer zone 18 of 10% to 40% filter efficiency, the inner zone occupying from 30% to 60% of the cross-sectional area of the filter. The filter is attached to a tobacco rod 10 by a tipping 14 having perforations 24 admitting air into the filter.

REFERENCES:
patent: 4026306 (1977-05-01), Berger
patent: 4034765 (1977-07-01), Hall
patent: 4088065 (1978-05-01), Hall
patent: 4291711 (1981-09-01), Berger
patent: 4355995 (1982-10-01), Berger
patent: 4357950 (1982-11-01), Berger
patent: 4498488 (1985-02-01), Johnson
patent: 4508525 (1985-04-01), Berger
patent: 4768526 (1988-09-01), Pryor
patent: 4776354 (1988-10-01), Norman et al.
patent: 4874004 (1989-10-01), Borowski et al.
"The Design of Cigarettes" by Browne Second Edition 1981 by Celanese Corporation pp. 40-46.

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