Tobacco – Smoke separator or treater – By adding constituent to smoke stream
Patent
1997-09-03
1999-06-29
Weiss, John G.
Tobacco
Smoke separator or treater
By adding constituent to smoke stream
131331, A24D 304
Patent
active
059153881
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a device which may be mounted on a cigarette and the like to control free burn rate of a lit cigarette.
BACKGROUND OF THE INVENTION
Free burn rate in reference to cigarettes and the like relates to the rate at which the coal or burning ember of a lit cigarette advances along the cigarette when the cigarette is not being smoked. Considerable thought has been given to free burn rate of a cigarette from the standpoint of reducing sidestream smoke generated during the idle phase of the lit cigarette. Various cigarette tobacco and cigarette paper designs have been suggested which, in one way or another, affect free burn rate with a view to reducing sidestream smoke and/or achieving an extinguishment of the lit cigarette when left idle over an extended period of time. Such designs include a judicious selection of tobacco blends, densities and multiple layers of cigarette tobacco in the tobacco rod. Such selection can appreciably retard the free burn rate of the cigarette and hence increase the number of puffs obtained per unit length of cigarette. Either in combination with tobacco selection and construction, or independently of the tobacco make-up, various cigarette paper compositions can also affect free burn rate of the cigarette. Such paper compositions include the use of chemicals to retard free burn rate, multiple wrappings of different types of cigarette paper of the same or different characteristics and reduction of cigarette paper air permeability. In addition to the use of chemicals to extinguish a cigarette when not being smoked, there are a variety of cigarette extinguishing devices. A cigarette ashtray may have a well dimensioned to receive the lit end of the cigarette, such that when the lit end of the cigarette is positioned in the well, the supply of oxygen to the burning coal is substantially reduced such that the cigarette extinguishes very quickly. Another approach to achieve extinguishment of the cigarette is to provide on the cigarette a ring of combustible or meltable material which releases into the tobacco upon melting at the temperature of the burning coal a suitable chemical for immediately extinguishing the cigarette.
Exemplary patents which describe designs in keeping with the above-noted approach in modifying tobacco and paper make up include published EP application 540,361, published May 5, 1993, published EP application 495,567 published Jul. 22, 1992, Canadian Patent 1,259,008 Canadian Patent 1,223,495 Canadian Patent 1,211,021 and Canadian patent 1,300,459.
An approach to reducing the possibility of a burning cigarette starting fires, is to house the cigarette in a screen mesh as described in U.S. Pat. No. 4,194,516. The screen mesh houses the burning portion of the cigarette to thereby contain any sparks and the like which may come off of the cigarette during the smoking process. Although this device may reduce the chances of starting a fire with a lit cigarette, it does not affect the free burn rate of the cigarette, because the screen is of an open mesh design.
French patent 2,556,184 describes a device which may be mounted on a cigarette to extinguish the cigarette at a predetermined location along its length. The device is designed to automatically and completely extinguish the cigarette when the advancing burning coal in the cigarette approaches the device. The device is in the form of a ring which is capable of being moved to any location along the cigarette. The ring is made of a material which melts to release an extinguishing agent which immediately extinguishes the burning end of the cigarette by penetrating the tobacco through to the burning coal. The extinguishing agent may include a perfume so as to avoid a disagreeable odor at the moment when the cigarette is extinguished. Although this device is effective for extinguishing a cigarette, it is not reusable and in being consumed and releasing a perfume into the cigarette, it does not permit re-smoking of the extinguished cigarette.
Another type of extinguishing ri
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Bowen Larry
Snaidr Stanislav M.
Anderson Charles W.
Rothmans, Benson & Hedges Inc.
Weiss John G.
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