Patent ID: 6748955
Filing Date: 2004-06-15
Classification: A24B,A24D,A24F

Abstract:
A device for minimizing cigarette sidestream smoke and reducing free-bum rate of a burning cigarette in combination with a filter tip,a) said device comprising: i) a non-combustible porous tubular element encasing an effective length of a tobacco charge of a cigarette located in said tubular element, said tubular element having an open end adjacent a distal end of said cigarette to permit lighting of the cigarette distal end and to permit ingress of air while said tobacco charge is burning; and ii) said tubular element having a predetermined porosity along at least its length which encases said effective length of said tobacco charge for both minimizing sidestream smoke emission from the tobacco charge when burning and reducing free-burn rate of the tobacco charge when burning to increase number of puffs from the tobacco charge when burning; and b) said filter tip comprising an inlet end and an outlet end, said inlet end having an annular sleeve with a central bore to receive an end of said cigarette, said annular sleeve having an outer shoulder onto which said tubular element is friction fitted, said central bore being in communication with a first inner tube of a first filter material, said first inner tube having a closed end opposite an end of said first inner tube in communication with said sleeve central bore, an annular space being provided outside of said first inner tube, a filter plug provided downstream of said annular space and filling said outlet end of said filter tip, a plenum between said filter plug and said first inner tube for transferring filtered smoke from said annular space to said filter plug.