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US 6,718,989 B1Granted
Filter for a cigarette and a filter-tipped cigarette
AssigneesJapan Tobacco Inc., Filtrona International Limited
InventorsPaul Clarke, John Charlton, Ichiro Atobe, Atsushi Tokida
Life of this patent
Estimating the term…
Abstract
A filter for a cigarette and a filter-tipped cigarette having a high degree of freedom in control of filtering-efficiency of smoke are provided. The filter has a core 10 and a sheath 12 made preferably of tow of cellulose acetate fibers. A plurality of axial passages 16 is formed between the core and the sheath and extend continuously between both end faces of the filter.
Claims19
A filter for a cigarette, comprising an assembly of a cylindrical core for filtering tobacco smoke from the cigarette;
- a tubular sheath made of filtering material selected from a tow or sheet of cellulose acetate fibers for filtering tobacco smoke from the cigarette, said tubular sheath surrounding said core, and provided between said core and said sheath are passages,
- wherein said passages are spaced circumferentially around said core and extending continuously between open ends at the two ends of the assembly, and a tipping paper circumferentially surrounding said sheath.
Dependencies are inferred from the claim text.