Cigarette having porous heat transfer tube
AssigneePhilip Morris USA Inc.
InventorHenry M. Dante
Life of this patent
Estimating the term…
Abstract
A smoking article includes a cylinder of smoking material, a filter attached to the cylinder of smoking material, and a tube of preferably porous and/or perforated material adapted to collapse at an open end upon exposure to thermal energy and preferably extending from one end portion of the smoking material to the junction of the filter and the cylinder of smoking material. Thermal energy generated by a burning portion of the tobacco filler material within the cylinder of smoking material is transferred by convection through the open portion of the tube after the end portion of the tube has collapsed closed by the heat from the burning portion of the tobacco.
Claims20
A smoking article, comprising:
- a cylinder of smoking material;
- a filter attached to said cylinder of smoking material;
- and
- a tube having at least one end portion and the tube adapted to collapse at the at least one end portion upon exposure to heat generated by combustion of said smoking material, said tube extending from an end of the smoking article opposite to said filter to a juncture of said filter and said cylinder of smoking material.
A smoking article, comprising:
- a cylinder of smoking material;
- a filter attached to the cylinder of smoking material, the filter including a heat activated agent;
- and
- a tube extending to a juncture of the filter and the smoking material and having at least one end portion, the tube being adapted to collapse at the at least one end portion upon exposure to heat generated by combustion of the smoking material, the heat activated agent activates when exposed to thermal energy communicated along the tube.
A smoking article, comprising:
- a cylinder of smoking material;
- a filter attached to the cylinder of smoking material;
- and
- a tube extending to a juncture of the filter and the smoking material, the tube being made from a porous heat shrink material and adapted to collapse at at least one end portion thereof upon exposure to heat generated by combustion of the smoking material.
A smoking article, comprising:
- a cylinder of smoking material;
- a filter attached to the cylinder of smoking material;
- and
- a tube extending to a juncture of the filter and the smoking material, the tube being made from a heat shrink material that has been perforated, the tube being adapted to collapse at at least one end portion thereof upon exposure to heat generated by combustion of the smoking material.
A smoking article, comprising:
- a cylinder of smoking material;
- a filter attached to the cylinder of smoking material;
- and
- a tube extending to a juncture of the filter and the smoking material, the tube comprising two layers of material having different thermal expansion coefficients, the tube being adapted to collapse at at least one end portion thereof upon exposure to heat generated by combustion of the smoking material.
A smoking article, comprising:
- a cylinder of smoking material;
- a filter attached to the cylinder of smoking material;
- and
- a tube having at least one end portion and extending to a juncture of the filter and the smoking material, the tube comprising two outer layers of material and an intermediate material between the two outer layers, the tube being adapted to collapse at the at least one end portion upon exposure to heat generated by combustion of the smoking material, the intermediate material being adapted to vaporize upon exposure to heat generated by combustion of the smoking material.
A method of making a smoking article, comprising:
- forming a tobacco rod portion of the smoking article by placing tobacco filler material between a tube having at least one end portion adapted to collapse upon exposure to heat generated by combustion of said tobacco filler material and an outer layer of wrapper paper;
- forming a filter portion of the smoking article having a plurality of segments with at least one of said segments comprising a heat activated agent that activates when exposed to thermal energy;
- and
- joining said tobacco rod portion in end-to-end relationship with said filter portion such that said tube provides at least a portion of a passageway from one end of said smoking article to said at least one segment of said filter portion comprising a heat activated agent.
A smoking article comprising a filter and a tobacco rod, said tobacco rod including a tube extending from an end of the smoking article opposite to said filter toward said filter, said tube being constructed of a heat collapsible material such that upon lighting and drawing upon the smoking article so as to create a coal, an end portion of said tube collapses so as to promote communication of thermal energy from said coal to said filter.
Dependencies are inferred from the claim text.