Smoking article

• US 4,969,476 A
• Filed: 09/16/1987
• Issued: 11/13/1990
• Est. Priority Date: 09/19/1986
• Status: Expired due to Term

• Current Assignee: Imperial Tobacco Limited (Imperial Tobacco Group PLC)
• Original Assignee: Imperial Tobacco Limited (Imperial Tobacco Group PLC)
• Inventors: Chard, Brian C., Garrett, Stephen J., Gill, Beresford R., Bale, Christopher R.
• Primary Examiner(s): Millin, V.
• Application Number:
  US07/097,477
• Time in Patent Office: 1,154 Days
• Field of Search: 131/359, 131/360, 131/364, 131/336, 131/194, 131/195, 131/335
• US Class Current: 131/336
• CPC Class Codes: A24D 1/22 Cigarettes with integrated combustible heat sources, e.g. with carbonaceous heat sources

Abstract

An elongate smoking article for releasing an aerosol into the mouth of a smoker comprises, a fuel rod having a light-up end adapted to be lit by a smoker; a tube extending from the fuel rod to a mouth end of the article thereby defining a condensation chamber between the fuel rod and the mouth end of the article; ventilation means to permit the passage of ventilating air from the light-up end of the fuel rod to the condensation chamber, and a porous ceramic cylindrical element impregnated with an aerosol precursor surrounding the fuel rod and in intimate contact with at least a portion thereof. A permeable fire-proof sheath surrounds the ceramic element, the sheath being adapted to provide physical integrity of the whole assembly, to allow the inward diffusion of air to maintain and propagate combustion of the fuel rod and to allow outward diffusion of combustion products.

Claims

1. An elongated smoking article for releasing an aerosol into the mouth of a smoker, the article comprising:

(a) a rod-like fuel-containing element having a light-up end adapted to be lit by a smoker;

(b) a cylindrical element surrounding the fuel element and in intimate contact with at least a portion of the fuel element, the cylindrical element comprising an inert substrate impregnated with an aerosol precursor;

(c) a tube extending from the fuel element to a mouth end of the article thereby defining a condensation chamber between the fuel element and cylindrical element and the mouth end of the article;

(d) ventilation means for permitting the passage of ventilating air from the light-up end of the fuel-containing element to the condensation chamber; and

(e) the fuel of the fuel-containing element having along the length thereof at least one part over which ventilating air from the ventilation means is, in use of the article, drawn to promote combustion.

2. An article as claimed in claim 1 wherein there is provided a permeable fire-proof sheath surrounding the inert substrate, the sheath being adapted to provide physical integrity of the whole assembly, to allow the inward diffusion of air to maintain and propagate combustion of the fuel element and to allow outward diffusion of combustion products.

3. An article as claimed in claim 2 wherein the fire-proof sheath is made of woven glass fibre cloth, or is a porous ceramic tube.

4. An article as claimed in claim 1 wherein the ventilation means is provided by at least one open-ended longitudinal channel defined between the fuel element and the cylindrical element, and extending from the light-up end of the fuel element towards the mouth end of the article.

5. An article as claimed in claim 4 wherein the cylindrical element is in intimate contact with the fuel element except for those parts of the cylindrical element and the fuel element defining said at least one longitudinal channel.

6. An article as claimed in claim 1 wherein the ventilation means is provided by at least one longitudinal channel passing either through the fuel element itself or through the inert substrate.

7. An article as claimed in claim 1 wherein the fuel element is composed predominantly of a carbonaceous fuel.

8. An article as claimed in claim 7 wherein the fuel element includes an oxidizing agent or burn promoter, and a binder.

9. An article as claimed in claim 1 wherein the fuel element is provided with a primer including as an active principle potassium nitrate or potassium carbonate.

10. An article as claimed in claim 1 wherein the substrate is made of ceramic fibre or porous ceramic material.

11. An article as claimed in claim 1 wherein the aerosol precursor is a high boiling point ester, hydrocarbon, or polyol with a boiling point in the range 150 to 250 C in admixture with nicotine and one or more flavourants.

12. An article as claimed in claim 11 wherein the polyol is selected from the group consisting of propylene glycol and glycerol.

13. An article as claimed in claim 1 wherein the tube is made of stiff cellulosic or plastics material.

14. An article as claimed in claim 1 wherein the tube includes a smoke filter element at its mouth end.

15. An article as claimed in claim 14 wherein the filter element is made of cellulose acetate.