Filter device

Details Filter device Filter device

1982-06-23

1984-11-06

Millin, Vincent

Tobacco

Smoke separator or treater

By adding constituent to smoke stream

131338, 131339, 131361, 493 39, 493 47, A24D 304

Patent

active

044806493

ABSTRACT:
This invention provides a cigarette filter comprising a filter core (2), a plugwrap (4) around the core, a profiled spacer wrap (6) around the plugwrap, and tipping material (8) around the spacer wrap, the profiled spacer wrap providing between the plugwrap and tipping material passages (14,16) which are in lateral air flow communication and extend longitudinally of the filter to open at an end thereof, the tipping material providing in use of the filter for the drawing of external air therethrough directly into at least some of the said passages, and the plugwrap beneath the passages being smoke-impermeable. The spacer wrap may be longitudinally corrugated to provide adjacent longitudinal passages (14,16) which are in air flow communication via apertures (15) through the side walls of the corrugations.

REFERENCES:
patent: 3490461 (1970-01-01), Osmalov et al.
patent: 3596663 (1971-08-01), Schultz et al.
patent: 4338956 (1982-07-01), Sanford et al.
patent: 4357950 (1982-11-01), Berger

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