Cigarette sidestream smoke and free-burn rate control device

A device for minimizing cigarette sidestream smoke and reducing free-burn rate of a burning cigarette, 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 while said cigarette is smoked and said open end is adjacent a distal end of said cigarette to permit lighting of such cigarette distal end and permits ingress of air;
• 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 a burning tobacco charge and reducing free-burn rate of such burning tobacco charge to increase number of puffs from such burning tobacco charge, where said predetermined porosity for said tubular element;
• a) retains around a burning ember of said cigarette oxygen deprived combustion gases within said tubular element to reduce rate of combustion and minimizes release of smoke particles through said porous tubular element;
• and
• b) restricts inward flow of air to reduce free-burn rate of said cigarette,
• iii) said cigarette having a diameter ranging from about 4 to 8 mm.

A device for minimizing cigarette sidestream smoke and reducing free-burn rate of a burning cigarette, said device comprising:

• i) a non-combustible porous tubular element encasing an effective length of a tobacco charge of a thin cigarette located in said tubular element, said tubular element having an open end while said cigarette is smoke and said open end is adjacent a distal end of said cigarette to permit lighting of such cigarette distal end and permits ingress of air;
• 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 a burning tobacco charge and reducing free-burn rate of such burning tobacco charge to increase number of puffs from such burning tobacco charge, where said predetermined porosity for said tubular element;
• a) retains around a burning ember of said cigarette oxygen deprived combustion gases within said tubular element to reduce rate of combustion and minimizes release of smoke particles through said porous tubular element;
• and
• b) restricts inward flow of air to reduce free-burn rate of said cigarette,
• iii) wherein said tubular element is adapted to encase said thin cigarette having a diameter in the range of about 4 to 6 mm, a filter tip for said tubular element having 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 tube having a closed end opposite an end of said tube which is in communication with said sleeve central bore, an annular space being provided outside of said first tube, a filter plug provided downstream of said annular space and filling said outlet end of said filter tip, means between said filter plug and said first tube for defining a plenum to transfer filtered smoke from said annular space to said filter plug.