Tobacco – Tobacco users' appliance – Device used for smoking
Patent
1997-02-27
2000-08-01
Silverman, Stanley S.
Tobacco
Tobacco users' appliance
Device used for smoking
162139, 264642, 264643, 264667, 131365, 131358, 131375, A24D 102, A24B 1512, A24B 314
Patent
active
060951524
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to smoking articles, and in particular to smoking articles which have an other than conventional structure and combustion regime, yet which have the outward appearance similar to a conventional smoking article.
Many attempts have been made to produce a smoking article which provides the smoker with an aerosol which is similar to tobacco smoke. Some ideas have centred on generating an aerosol vapour from an aerosol generating means by heating the aerosol generating means with a surrounding fuel source, such as cut tobacco. Smoke from the fuel source is prevented by a smoke barrier from reaching the smoker's mouth, whilst the aerosol vapour can pass to the smoker. These can be seen in U.S. Pat. Nos. 3,258,015 (Ellis) and 3,356,094 (Ellis). The first of these proposed a smoking article having an outer cylinder of fuel with good smouldering characteristics, preferably cut tobacco or reconstituted tobacco, surrounding a metal tube containing tobacco, reconstituted tobacco or other source of nicotine and water vapour. A substantial disadvantage of this article was the ultimate protrusion of the metal tube as the tobacco fuel was consumed. Other disadvantages include the formation of substantial tobacco pyrolysis products and substantial tobacco sidestream smoke. This design was later modified in the second patent mentioned above by employing a tube made out of a material such as inorganic salts or an epoxy bonded ceramic, which became frangible on heating and was discharged as an ash by the smoker. In this invention also there are substantial tobacco pyrolysis products and, because of the combustion of tobacco, visible sidestream smoke.
Aerosol inhalation devices such as European Patent Applications, Publication Nos. 0 174 645 and 0 339 690 describe means of using heat transfer from a fuel element to physically separate aerosol generating means. The main feature of these inventions is that the aerosol generating means is always physically separate from the fuel element and is always heated by heat transfer from a heat conducting member, never burned. To this end the fuel element is always short, located to one end of the smoking article and kept out of direct contact with the aerosol generating means.
Other and mainly more recent devices have included GB 1 185 887 (Synectics), U.S. Pat. No. 5,060,667 (Strubel) and EPA 0 405 190 (R. J. Reynolds). In all of these devices the patentee has arranged the fuel element as an annulus around aerosol generating means.
GB 1 185 857 provided a substantially inorganic smoke of readily absorbable salts to the smoker and produced an ash which could be removed in normal fashion by the smoker. However, the smoking article is presumed to have given off an amount of visible sidestream smoke because of the cellulosic components within individual items of the smoking article.
U.S. Pat. No. 5,060,667 provided a co-axially arranged tobacco-containing fuel element encircled by a metallic heat transfer tube with a flange portion at the end to be lit in order to prevent smoke from the burning tobacco from passing through the flavour source material circumscribing the heat transfer tube. Only aerosol from the flavour source material passes to the smoker. The device does not burn down and tobacco material is combusted, as well as providing the flavour source material, thereby producing visible sidestream smoke and utilising a high percentage of a costly item such as tobacco.
EPA 0 405 190 seeks to provide a smoking article which provides the user with the pleasures of smoking by heating without burning tobacco. Most of the articles comprise an annular carbonaceous fuel segment, a physically separate aerosol generating means disposed concentrically within the fuel segment, a barrier member between the fuel segment and the aerosol generating means, which substantially precludes fluid flow radially therethrough and which is disposable as the smoking article is smoked, and a mouthend segment. As the fuel source is disposed annularly around the aerosol generating me
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Materials Handbook, 12th edition. by Brady and Clauser, pp. 168 and 169, 1986.
Beven John Lawson
Dittrich David John
Greig Colin Campbell
Hook Richard Geoffrey
McAdam Kevin Gerard
British-American Tobacco Company Limited
Ruller Jacqueline A
Silverman Stanley S.
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