Tobacco-smoke filters

Details Tobacco-smoke filters Tobacco-smoke filters

1977-12-01

1979-08-07

Michell, Robert W.

Tobacco

Cigar or cigarette making

Including cooperating surfaces to induce rolling

131 107, 131 109, 131265, 55 74, A24B 1527, B01D 2702

Patent

active

041634527

ABSTRACT:
An improved tobacco-smoke filter or filter material contains granules of porous activated carbon to which has been applied a nitroxide of the group consisting of the nitroxide 4-oxo-2,2,6,6-tetramethylpiperidino-oxy, the nitroxide 1-nitronyl-3-oxyl-4,4,5,5-tetramethyl-2-phenyldihydroimidazole and mixtures thereof. The carbon may be loaded with 0.5 to 25%, suitably 1.0 to 15%, by weight of the nitroxide. Advantageously such a filter has provision for filter ventilation. For instance, in a triple filter with a center section containing the treated carbon, the said center section and/or the section upstream thereof is ventilated.

REFERENCES:
patent: 3359988 (1967-12-01), Thomson
patent: 3390688 (1978-07-01), Touey et al.

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