Tobacco-smoke filters

Details Tobacco-smoke filters Tobacco-smoke filters

1977-11-10

1980-07-22

Michell, Robert W.

Tobacco

Tobacco users' appliance

Supports

131 107, A24B 1502

Patent

active

042134706

ABSTRACT:
A tobacco-smoke filter has a filter body comprising at least one intermediate section which is located between end sections, has a cross section less than that of the end sections and lies wholly within the outline of the latter sections as viewed axially of the body, and a porous wrap of sheet material which is pervious to volatile constituents of tobacco smoke and which bounds, with the said body, at least one space affording a path through which smoke can pass when the filter is in use and from which said constituents are removed fom the smoke by diffusion through the said sheet material, each of the said sections being made of filter material. Suitably the body is of generally cylindrical form and composed of cellulose acetate. Advantageously the intermediate section is integral with at least one end section.

REFERENCES:
patent: 2819720 (1958-01-01), Burbig
patent: 2954773 (1960-10-01), Lebert
patent: 3752165 (1973-08-01), Harllee et al.
patent: 3768489 (1973-10-01), Kiefer et al.
patent: 3811451 (1974-05-01), Berger
patent: 3964493 (1976-06-01), Baker
patent: 4033362 (1977-07-01), Almquist et al.

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