Tobacco – Smoke separator or treater
Reexamination Certificate
1995-05-11
2001-11-06
Lewis, Aaron J. (Department: 3761)
Tobacco
Smoke separator or treater
C131S334000, C131S345000
Reexamination Certificate
active
06311696
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to smoking articles, and in particular, but not exclusively, to cigarettes.
2. Brief Description of Related Art
At the present time in the tobacco industry there is interest in ultra low delivery smoking articles, ultra low delivery meaning ultra low particulate matter delivery from the mainstream smoke of the cigarette. Ultra low particulate matter delivery cigarettes are cigarettes yielding about 5 mg or less particulate matter in the mainstream smoke. One problem with such cigarettes is that the smoker feels that there is little impact from the mainstream smoke upon smoking. A further problem is that the smoker also finds the smoke has a very low flavour amplitude. This is particularly evident in cigarettes having a particulate matter delivery of 1-2 mg.
This invention has application to low delivery cigarettes by offering means to increase the perceived smoke impact of such products and also to improve the perceived flavour of such products.
This invention has application to cigarettes having a mainstream particulate matter delivery of about 9 mg or less.
SUMMARY OF THE INVENTION
The present invention provides a smoking article comprising a filter element and a rod of tobacco material wrapped in a wrapper, the filter element comprising an alkaline filter material section, characterised in that the loading level of alkaline filter material is less than 12% by weight of the alkaline filter material section, and the characteristics of the smoking article are arranged so that, when smoked, the alkaline filter material is exposed to an amount of smoke acceptable to achieve an increased perception of smoke impact.
Preferably the increased perception of smoke impact is achieved without a mainstream smoke alkaline off-taste.
Advantageously the nicotine free dry particulate matter (NFDPM) to nicotine ratio is decreased compared with control cigarettes having the same cigarette characteristics without the addition of alkaline filter material to the filter element.
REFERENCES:
patent: 3368566 (1968-02-01), Avedikian
patent: 4266561 (1981-05-01), Litzinger
patent: 5105834 (1992-04-01), Saintsing et al.
patent: 5161549 (1992-11-01), Rosario
patent: 2308302 (1974-01-01), None
patent: 3200068 (1983-07-01), None
Dittrich David John
Fiebelkorn Richard Thomas
British-American Tobacco Company Limited
Lewis Aaron J.
Pitney Hardin Kipp & Szuch LLP
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