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US 2013/0255704 A1Published application
Filter
AssigneeBritish American Tobacco (Investments) Limited
InventorsJohn Roger Sampson, David Lewis
Life of this patent
Estimating the term…
Abstract
A filter for a cigarette comprises a porous material sheet wrapped around the filter rod and a cellulose acetate thread formed tram substantially uncrimped cellulose acetate filaments. The cellulose acetate thread is positioned within the filter rod and extends along the central axis of the filter rod.
Claims12
A filter for a cigarette or other smoking article comprising:
- a porous filter rod having a substantially cylindrical shape, and
- a cellulose acetate thread formed from cellulose acetate filaments, the cellulose acetate thread extending along the filter substantially parallel to the central cylindrical axis of the filter rod,
- wherein the porous filter rod has a bulk density in the range 50-150 kg/m3 and the cellulose acetate thread has a bulk density in the range 400-800 kg/m3.
Dependencies are inferred from the claim text.