US3370595A - Smoke filters - Google Patents

Smoke filters Download PDF

Info

Publication number
US3370595A
US3370595A US423105A US42310565A US3370595A US 3370595 A US3370595 A US 3370595A US 423105 A US423105 A US 423105A US 42310565 A US42310565 A US 42310565A US 3370595 A US3370595 A US 3370595A
Authority
US
United States
Prior art keywords
plasticizer
filter
smoke
cigarette
filamentary material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US423105A
Other languages
English (en)
Inventor
Howard J Davis
Robert F Busse
Thomas W George
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Celanese Corp
Original Assignee
Celanese Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Celanese Corp filed Critical Celanese Corp
Priority to US423105A priority Critical patent/US3370595A/en
Priority to DE19651517265 priority patent/DE1517265A1/de
Priority to NL6517246A priority patent/NL6517246A/xx
Priority to IT162/66A priority patent/IT941496B/it
Priority to GB247/66A priority patent/GB1117188A/en
Priority to BE674702D priority patent/BE674702A/xx
Priority to CH6466A priority patent/CH454713A/fr
Priority to AT7566A priority patent/AT272913B/de
Priority to FR44738A priority patent/FR1462768A/fr
Application granted granted Critical
Publication of US3370595A publication Critical patent/US3370595A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/16—Use of materials for tobacco smoke filters of inorganic materials
    • A24D3/163—Carbon
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/02—Manufacture of tobacco smoke filters
    • A24D3/0204—Preliminary operations before the filter rod forming process, e.g. crimping, blooming
    • A24D3/0212—Applying additives to filter materials
    • A24D3/022—Applying additives to filter materials with liquid additives, e.g. application of plasticisers
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/14—Use of materials for tobacco smoke filters of organic materials as additive

Definitions

  • Smoke filters of multi-segrnent construction containing at least one segment carrying a selective removal agent such as activated carbon and a low amount of plasticizer, and at least one second segment being generally free of said removal agent and containing a high percentage of plasticizer, the filters being characterized by enhanced smoke removal efficiencies over longer storage times as compared to conventional removal agent containing smoke filters.
  • This invention relates to smoke filters. More specifically, this invention relates to cigarette smoke filters or filter tips.
  • the smoke stream of a cigarette is a mixture; it consists of a particulate phase and a gas or vapor phase. Both phases, but especially the particulate phase, contain filterable substances commonly known as tars. Phenol and cresols are found in the weak acid fraction of smoke condensate.
  • the gas, or, more accurately, vapor phase includes light hydrocarbons, isoprene, furan, acetaldehyde, Z-methyl furan, propionaldehyde, isobutyraldehyde, acrolein, methanol, acetone, methyl ethyl ketone, and toluene.
  • Smoke removal efficiency is the percentage of the total tars or condensate in the over-all cigarette smoke stream'which is removed by a given filter tip; accordingly, the total level of tars can be controlled by means of greater smoke removal efiiciency.
  • this is not a means of selectively removing deleterious substances from the smoke stream and, furthermore, is limited by the fact that smoke removal efiiciency is increased by increasing the pressure drop across the filter and a filter with too high pressure drop results in a cigarette which is difiicult or uncomfortable to draw upon.
  • a plasticizer for the filamentary material is used in order to impart to the filter tip adequate firmness.
  • the amount of plasticizer carried by the filamentary material is more than 5% and less than 10% by weight, based on the weight of the filamentary material.
  • some of the plasticizer migrates from the filaments to the activated carbon and thereby substantially deactivates the carbon.
  • a smoke filter comprising a plurality of sections in series, at least one of said sections being a high plasticizer section (i.e., containing a relatively high proportion of plasticizer) comprising filamentary material and carrying at least about 10% by Weight of plasticizer for such filamentary material (which is a relatively high proportion), based on the weight of said filamentary material, and at least one other of said sections being a low plasticizer section (i.e., a section containing a relatively low proportion of plasticizer) comprising filamentary material interspersed with particles of a selective removal agent and carrying a maximum of about 5% plasticizer for said filamentary material (which is a relatively low proportion of plasticizer), based on the weight of said filamentary material.
  • a high plasticizer section i.e., containing a relatively high proportion of plasticizer
  • a low plasticizer section i.e., a section containing a relatively low proportion of plasticizer
  • any filamentary material may be used.
  • functional equivalents of filamentary materials such as polymeric flakes or strips of paper may be used.
  • the filamentary material comprise cellulose acetate.
  • the term cellulose acetate as used in the present specification and claims includes both secondary cellulose acetate, i.e., cellulose acetate having an acetyl value of about 5058% but preferably the well known secondary cellulose acetate of commerce having an acetyl value of about 5355% and cellulose triacetate, i.e., cellulose acetate having an acetyl value of at least 59%; acetyl value is calculated as combined acetic acid by weight and has a theoretical maximum of 62.5%.
  • Secondary cellulose acetate is especially preferrred because it is somewhat more conveniently plasticizable than cellulose triacetate.
  • Any selective removal agent may be used.
  • Polyethylene glycols and activated carbon are examples of selective removal agents.
  • Activated carbon appears to be especially effective and a particularly useful form thereof is activated charcoal.
  • the high plasticizer section carry more than 12% plasticizer on the above-explained basis, which basis for the sake of convenience will hereafter beimplied and not explicitly stated. It is also highly preferred that the low plasticizer section carry less than 4% plasticizer.
  • the maximum plasticizer content in the high plasticizer section may be up to about 50%. It is preferred that the low plasticizer section carry a minimum of about 1% of plasticizer. Selection of a plasticizer is not critical; however, triacetin and triethyl citrate are preferred plasticizers since to some extent they selectively sorb acidic compounds such as phenol and cresols from the smoke stream and thereby add to the effectiveness of the filter.
  • a smoke filter simply comprising filamentary material interspersed with particles of a selective removal agent and carrying less than 4% plasticizer and preferably a minimum of about 1% of plasticizer.
  • Cellulose acetate and, especially secondary cellulose acetate are the preferred filamentary materials and triacetin and triethyl citrate are the preferred plasticizers.
  • Functional equivalents material is intended to include such functional equivalents as above mentioned.
  • the filters V of the present invention when incorporated in a cigarette,
  • the plasticizer in the filters of the present invention acts as a scavenger for the organic and inorganic tobacco additives referred to above which normally enter into an equilibrium state with the filter; apparently, in the filters of the present invention, the equilibrium is established primarily with the plasticizer and thus the sorptive sites of both the filamentary material and the selective removal agent are left free, and not until a period of about two full months has passed do these parts of the filter begin to substantially enter into the equilibrium.
  • the plasticizer content carried by the filamentary material in which the selective removal agent is interspersed is kept sufficiently low so that the selective removal agent is not significantly contaminated and thereby decreased in effectiveness.
  • a high plasticizer content it provided because thereby the selective removal properties of the plasticizer can be taken advantage of without the disadvantage of contamination of selective removal agent.
  • selective removal agent or smoke filter agent are intended to denote materials other than plasticizer and are intended not to denote plasticizer though, as pointed out above, the plasticizer itself may have a significant selective removal effect.
  • the efiectiveness of the smoke filters of the present invention can especially significantly be represented in terms of recently noted physiological eifects of cigarette smoke.
  • the human respiratory system is provided with cilia which, apparently, filter whatever one inhales. These cilia .wave back and forth with a steady frequency under normal conditions. It is observed that cigarette smoke tends to interfere with the normal operation of the cilia.
  • the steady rhythmic action of the cilia is disrupted by cigarette smoke and the overall effect is to greatly decrease the frequency at which the cilia wave back and forth; this efiect is known as ciliastasis.
  • the inner demibranch of a clam gill is also provided with cilia. These cilia apparently function very much in the same way as human respiratory cilia, however filtering water rather than air.
  • the cigarette smoke is passed over a tissue section of clam gill containing these cilia; to simulate cigarette smoking, the smoke is passed over the tissue section in puff-like quantities at pufi-like intervals.
  • the frequency of the cilia motion is measured by use of an electronic stroboscope. In this manner the ciliastatic eifect of various cigarettes, with and without filters, may be measured.
  • the frequency of cilia motion is plotted against the number of pufis.
  • EXAMPLE To a tow of 50,000 secondary cellulose acetate filaments of I-beam cross section and 2.5 denier per'filament there is applied by spraying 14% of triacetin and the tow is made into ten millimeter length tips; conventional cigarette filter manufacturing apparatus is used. Similarly, ten millimetertips are prepared from a tow of 45,000 secondary cellulose acetate filaments of regular cross-section and 5.0 denier per filament with a plasticizer application of 3.8% of triacetin and, also, an application of 62 milligrams of 50X 200 mesh activated charcoal per ten mil- 4 limeter tip. The total Weight of the first mentioned tip is milligrams and the total weight of the latter tip is 132 milligrams.
  • the non-charcoal tip is attached to a non-filter cigarette and the non-charcoal and charcoal tips are attached together as a dual tip to a second non-filter cigarette with the non-charcoal section at the end to avoid the passage of charcoal to the smokers mouth.
  • Both of these filter cigarettes are checked for ciliastatic effect and compared in this'regard to conventional filter and non-filter cigarettes.
  • the graph shows a plot of cilia frequency against the number of puffs.
  • Curve one is for a cigarette with the above described dual filter tip according to the present invention
  • curve two is for a cigarette with the above described single component activated charcoal-containing filter tip according to the present invention
  • curve three is for a widely sold representative activated charcoal-containing filter tip cigarette
  • curve four is for a widely sold representative non-charcoal secondary cellulose acetate
  • filter tip cigarette and curve five is for a widely sold representative non-filter cigarette. It is apparent from the graph that cigarettes tipped with the filters of the present invenion cause a much lesser ciliastatic effect than the cigarettes of various types of the prior art. This improvement is due to the fact that the filters of the present invention are substantially more effective at selectively removing the aforementioned deleterious compounds from a cigarette smoke stream; this is demonstrable, for example, by
  • activated carbon when activated carbon is incorporated in a filter tip or filter tip section it is preferred to use at least about 40 milligrams and up to about 90 milligrams or more of activated carbon per 10 mm. of tip length.
  • the amount of activated carbon necessary to achieve a given degree of filtration effectiveness is, of course, to some extent dependent-upon the kind of activated carbon used and the mesh of the activated carbon; generally speaking the finer the mesh-the less the quantity of activated carbon necessary to achieve a given degree of filtration eifectiveness.
  • the tows or other filamentary or functionally equivalent materials themselves from which the filter tips are made are conventional; i.e., the present invention does not lie in the filamentary material or functional equivalent thereof per se.
  • a smoke filter comprising a plurality of sections in series, at least one of said sections being a high plasticizer section comprising filamentary material and carrying at least about 10% by weight of plasticizer for said filamentary material, based on the weight of said filamentary material, and at least one other of said sections being a low plasticizer section comprising filamentary mtaerial interspersed with particles of a smoke filter agent whose smoke filtering ability would be masked by a high amount of plasticizer and carrying a maximum of about 5% of plasticizer for said filamentary material, based on the weight of said filamentary material.
  • a cigarette filter comprising a plurality of sections in series
  • At least one of said sections comprising a mass of supporting cellulose acetate filamentary material carrying at least 12 percent by weight, based on the weight of the filamentary material, of an organic ester plasticizer therefor,
  • said sections comprising a mass of supporting cellulose acetate filamentary material carrying less than 4 percent by weight, based on the weight of the filamentary material, of an organic ester plasticizer therefor, and from about 40 to about 90 mg., per 10 millimeters of standard tip length, of a smoke filter agent whose smoke filtering ability would be masked by a high amount of plasticizer said filter being characterized by enhanced retention of smoke removal efiiciency over periods of at least three weeks as compared to conventional cigarette filters, and
  • a delivered smokestream upon treatment of the combustion products of a conventional cigarette tobacco column, yielding reduced ciliastasis in ciliary tissue derived from the inner demibranch of a clam gill.
  • said low plasticizer section carries a minimum of about 1% by weight of plasticizer for said filamentary material, based on the weight of said filamentary material.
  • said plasticizer comprises a compound selected from the group consisting of triacetin and triethyl citrate.
  • said plasticizer comprises triacetin.
  • said plasticizer comprises triethyl citrate.
  • a method of selectively filtering smoke comprising treating said smoke, in successive zones arranged in any order, with a filter segment comprising a mass of supporting fibrous material carrying a plasticizer therefor and a smoke filter agent whose smoke filtering ability would be masked by a high amount of plasticizer and another filter segment comprising a mass of supporting fibrous material carrying a plasticizer therefor, said latter segment being generally free of said agent, the amount of plasticizer in said former segment being considerably less than the amount of plasticizer in said latter segment.
  • the cigarette filter of claim 6, wherein said agent is selected from the group consisting of activated carbons and charcoals and polyethylene glycols.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
US423105A 1965-01-04 1965-01-04 Smoke filters Expired - Lifetime US3370595A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US423105A US3370595A (en) 1965-01-04 1965-01-04 Smoke filters
DE19651517265 DE1517265A1 (de) 1965-01-04 1965-12-31 Zigarettenfilter
NL6517246A NL6517246A (fr) 1965-01-04 1965-12-31
IT162/66A IT941496B (it) 1965-01-04 1966-01-03 Filtro per sigarette
GB247/66A GB1117188A (en) 1965-01-04 1966-01-04 Filters
BE674702D BE674702A (fr) 1965-01-04 1966-01-04
CH6466A CH454713A (fr) 1965-01-04 1966-01-04 Filtre pour cigarettes
AT7566A AT272913B (de) 1965-01-04 1966-01-04 Zigarettenfilter
FR44738A FR1462768A (fr) 1965-01-04 1966-01-04 Filtres pour cigarettes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US423105A US3370595A (en) 1965-01-04 1965-01-04 Smoke filters

Publications (1)

Publication Number Publication Date
US3370595A true US3370595A (en) 1968-02-27

Family

ID=23677698

Family Applications (1)

Application Number Title Priority Date Filing Date
US423105A Expired - Lifetime US3370595A (en) 1965-01-04 1965-01-04 Smoke filters

Country Status (9)

Country Link
US (1) US3370595A (fr)
AT (1) AT272913B (fr)
BE (1) BE674702A (fr)
CH (1) CH454713A (fr)
DE (1) DE1517265A1 (fr)
FR (1) FR1462768A (fr)
GB (1) GB1117188A (fr)
IT (1) IT941496B (fr)
NL (1) NL6517246A (fr)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3422176A (en) * 1965-10-14 1969-01-14 Celanese Corp Process for spinning filaments of nonuniform cross section
US20050066982A1 (en) * 2003-09-30 2005-03-31 Clark Melissa Ann Filtered cigarette incorporating an adsorbent material
WO2007033272A1 (fr) 2005-09-14 2007-03-22 R. J. Reynolds Tobacco Company Article pour fumeur à filtre
US20070215167A1 (en) * 2006-03-16 2007-09-20 Evon Llewellyn Crooks Smoking article
US20070215168A1 (en) * 2006-03-16 2007-09-20 Banerjee Chandra K Smoking article
US20080245377A1 (en) * 2007-04-04 2008-10-09 R.J. Reynolds Tobacco Company Cigarette comprising dark-cured tobacco
US20080295853A1 (en) * 2007-05-31 2008-12-04 R. J. Reynolds Tobacco Company Filtered Smoking Article
US20090090372A1 (en) * 2005-09-23 2009-04-09 R.J. Reynolds Tobacco Company Equipment for Insertion of Objects into Smoking Articles
US20090288669A1 (en) * 2008-05-21 2009-11-26 R.J. Reynolds Tobacco Company Cigarette filter comprising a degradable fiber
US20090288672A1 (en) * 2008-05-21 2009-11-26 R. J. Reynolds Tobacco Company Cigarette Filter Comprising a Carbonaceous Fiber
US20100122708A1 (en) * 2008-11-20 2010-05-20 R. J. Reynolds Tobacco Company Adsorbent Material Impregnated with Metal Oxide Component
US20100125039A1 (en) * 2008-11-20 2010-05-20 R. J. Reynolds Tobacco Company Carbonaceous Material Having Modified Pore Structure
US20110108044A1 (en) * 2009-11-11 2011-05-12 R.J. Reynolds Tobacco Company Filter element comprising smoke-altering material
US20110180084A1 (en) * 2010-01-27 2011-07-28 R.J. Reynolds Tobacco Company Apparatus and associated method for forming a filter component of a smoking article
WO2011140430A1 (fr) 2010-05-07 2011-11-10 R. J. Reynolds Tobacco Company Cigarette à filtre avec caractéristiques sensorielles modifiables
US8079369B2 (en) 2008-05-21 2011-12-20 R.J. Reynolds Tobacco Company Method of forming a cigarette filter rod member
WO2012016051A2 (fr) 2010-07-30 2012-02-02 R. J. Reynolds Tobacco Company Élément filtre comprenant un matériau fibreux multifonction altérant la fumée
EP2537427A1 (fr) 2008-05-21 2012-12-26 R.J. Reynolds Tobacco Company Filtre pour cigarette ayant des structures de fibres composées
WO2013043806A2 (fr) 2011-09-23 2013-03-28 R. J. Reynolds Tobacco Company Produit à fibres mixtes pour l'utilisation dans la fabrication d'éléments de filtre de cigarette, et procédés, systèmes et appareils associés
US8739802B2 (en) 2006-10-02 2014-06-03 R.J. Reynolds Tobacco Company Filtered cigarette
US10076135B2 (en) 2014-05-23 2018-09-18 Greenbutts Llc Biodegradable cigarette filter tow and method of manufacture
US10188140B2 (en) 2005-08-01 2019-01-29 R.J. Reynolds Tobacco Company Smoking article
US10609955B2 (en) 2011-04-08 2020-04-07 R.J. Reynolds Tobacco Company Filtered cigarette comprising a tubular element in filter
US11957163B2 (en) 2011-04-08 2024-04-16 R.J. Reynolds Tobacco Company Multi-segment filter element including smoke-altering flavorant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3032829A (en) * 1958-02-11 1962-05-08 Celanese Corp Processing tow
US3101723A (en) * 1960-11-15 1963-08-27 Philip Morris Inc Fibrous cigarette filter
US3169535A (en) * 1962-01-18 1965-02-16 Lassiter Cigarette
US3190294A (en) * 1958-09-30 1965-06-22 Celanese Corp Cigarette filters

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3032829A (en) * 1958-02-11 1962-05-08 Celanese Corp Processing tow
US3190294A (en) * 1958-09-30 1965-06-22 Celanese Corp Cigarette filters
US3101723A (en) * 1960-11-15 1963-08-27 Philip Morris Inc Fibrous cigarette filter
US3169535A (en) * 1962-01-18 1965-02-16 Lassiter Cigarette

Cited By (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3422176A (en) * 1965-10-14 1969-01-14 Celanese Corp Process for spinning filaments of nonuniform cross section
US20050066982A1 (en) * 2003-09-30 2005-03-31 Clark Melissa Ann Filtered cigarette incorporating an adsorbent material
US8066011B2 (en) 2003-09-30 2011-11-29 R. J. Reynolds Tobacco Company Filtered cigarette incorporating an adsorbent material
US9554594B2 (en) 2003-09-30 2017-01-31 R.J. Reynolds Tobacco Company Filtered cigarette incorporating an adsorbent material
US10188140B2 (en) 2005-08-01 2019-01-29 R.J. Reynolds Tobacco Company Smoking article
US8678013B2 (en) 2005-08-01 2014-03-25 R.J. Reynolds Tobacco Company Smoking article
US20100186757A1 (en) * 2005-08-01 2010-07-29 Crooks Evon L Smoking Article
WO2007033272A1 (fr) 2005-09-14 2007-03-22 R. J. Reynolds Tobacco Company Article pour fumeur à filtre
US11383477B2 (en) 2005-09-23 2022-07-12 R.J. Reynolds Tobacco Company Equipment for insertion of objects into smoking articles
US9028385B2 (en) 2005-09-23 2015-05-12 R.J. Reynolds Tobacco Company Equipment for insertion of objects into smoking articles
US8882647B2 (en) 2005-09-23 2014-11-11 R.J. Reynolds Tobacco Company Equipment for insertion of objects into smoking articles
US10123562B2 (en) 2005-09-23 2018-11-13 R.J. Reynolds Tobacco Company Equipment for insertion of objects into smoking articles
US20090090372A1 (en) * 2005-09-23 2009-04-09 R.J. Reynolds Tobacco Company Equipment for Insertion of Objects into Smoking Articles
US9398777B2 (en) 2005-09-23 2016-07-26 R.J. Reynolds Tobacco Company Equipment for insertion of objects into smoking articles
EP3569079A1 (fr) 2006-03-16 2019-11-20 R. J. Reynolds Tobacco Company Article à fumer
US9220301B2 (en) 2006-03-16 2015-12-29 R.J. Reynolds Tobacco Company Smoking article
EP2241203A2 (fr) 2006-03-16 2010-10-20 R. J. Reynolds Tobacco Company Article à fumer
US12048325B2 (en) 2006-03-16 2024-07-30 R.J. Reynolds Tobacco Company Smoking article
US10258079B2 (en) 2006-03-16 2019-04-16 R.J. Reynolds Tobacco Company Smoking article
EP2762020A2 (fr) 2006-03-16 2014-08-06 R. J. Reynolds Tobacco Company Article à fumer
US20070215168A1 (en) * 2006-03-16 2007-09-20 Banerjee Chandra K Smoking article
US20070215167A1 (en) * 2006-03-16 2007-09-20 Evon Llewellyn Crooks Smoking article
EP2486812A1 (fr) 2006-03-16 2012-08-15 R.J. Reynolds Tobacco Company Article à fumer
US8739802B2 (en) 2006-10-02 2014-06-03 R.J. Reynolds Tobacco Company Filtered cigarette
US8186360B2 (en) 2007-04-04 2012-05-29 R.J. Reynolds Tobacco Company Cigarette comprising dark air-cured tobacco
US20080245377A1 (en) * 2007-04-04 2008-10-09 R.J. Reynolds Tobacco Company Cigarette comprising dark-cured tobacco
US20080295853A1 (en) * 2007-05-31 2008-12-04 R. J. Reynolds Tobacco Company Filtered Smoking Article
WO2008150787A2 (fr) * 2007-05-31 2008-12-11 R.J. Reynolds Tobacco Company Filtre et article à fumer comprenant celui-ci
WO2008150787A3 (fr) * 2007-05-31 2009-04-09 Reynolds Tobacco Co R Filtre et article à fumer comprenant celui-ci
US20090288672A1 (en) * 2008-05-21 2009-11-26 R. J. Reynolds Tobacco Company Cigarette Filter Comprising a Carbonaceous Fiber
US8079369B2 (en) 2008-05-21 2011-12-20 R.J. Reynolds Tobacco Company Method of forming a cigarette filter rod member
EP2537427A1 (fr) 2008-05-21 2012-12-26 R.J. Reynolds Tobacco Company Filtre pour cigarette ayant des structures de fibres composées
US8375958B2 (en) 2008-05-21 2013-02-19 R.J. Reynolds Tobacco Company Cigarette filter comprising a carbonaceous fiber
US8496011B2 (en) 2008-05-21 2013-07-30 R.J. Reynolds Tobacco Company Apparatus for forming a filter component of a smoking article
US8613284B2 (en) 2008-05-21 2013-12-24 R.J. Reynolds Tobacco Company Cigarette filter comprising a degradable fiber
US20090288669A1 (en) * 2008-05-21 2009-11-26 R.J. Reynolds Tobacco Company Cigarette filter comprising a degradable fiber
US8511319B2 (en) 2008-11-20 2013-08-20 R. J. Reynolds Tobacco Company Adsorbent material impregnated with metal oxide component
US20100125039A1 (en) * 2008-11-20 2010-05-20 R. J. Reynolds Tobacco Company Carbonaceous Material Having Modified Pore Structure
US20100122708A1 (en) * 2008-11-20 2010-05-20 R. J. Reynolds Tobacco Company Adsorbent Material Impregnated with Metal Oxide Component
US8119555B2 (en) 2008-11-20 2012-02-21 R. J. Reynolds Tobacco Company Carbonaceous material having modified pore structure
WO2010098933A1 (fr) 2009-02-25 2010-09-02 R.J. Reynolds Tobacco Company Filtre de cigarette comportant une fibre dégradable
WO2011060008A1 (fr) 2009-11-11 2011-05-19 R. J. Reynolds Tobacco Company Élément filtre comprenant un matériau de modification de fumée
US8997755B2 (en) 2009-11-11 2015-04-07 R.J. Reynolds Tobacco Company Filter element comprising smoke-altering material
US20110108044A1 (en) * 2009-11-11 2011-05-12 R.J. Reynolds Tobacco Company Filter element comprising smoke-altering material
US20110180084A1 (en) * 2010-01-27 2011-07-28 R.J. Reynolds Tobacco Company Apparatus and associated method for forming a filter component of a smoking article
WO2011094171A1 (fr) 2010-01-27 2011-08-04 R. J. Reynolds Tobacco Company Appareil et procédé associé permettant de former un composant de filtre d'un article à fumer
WO2011140430A1 (fr) 2010-05-07 2011-11-10 R. J. Reynolds Tobacco Company Cigarette à filtre avec caractéristiques sensorielles modifiables
US9119420B2 (en) 2010-07-30 2015-09-01 R.J. Reynolds Tobacco Company Filter element comprising multifunctional fibrous smoke-altering material
US8720450B2 (en) 2010-07-30 2014-05-13 R.J. Reynolds Tobacco Company Filter element comprising multifunctional fibrous smoke-altering material
WO2012016051A2 (fr) 2010-07-30 2012-02-02 R. J. Reynolds Tobacco Company Élément filtre comprenant un matériau fibreux multifonction altérant la fumée
US10609955B2 (en) 2011-04-08 2020-04-07 R.J. Reynolds Tobacco Company Filtered cigarette comprising a tubular element in filter
US11957163B2 (en) 2011-04-08 2024-04-16 R.J. Reynolds Tobacco Company Multi-segment filter element including smoke-altering flavorant
EP3456212A1 (fr) 2011-09-23 2019-03-20 R. J. Reynolds Tobacco Company Produit à fibres mixtes à utiliser dans la fabrication d'éléments de filtre de cigarette et procédés, systèmes et appareils connexes
WO2013043806A2 (fr) 2011-09-23 2013-03-28 R. J. Reynolds Tobacco Company Produit à fibres mixtes pour l'utilisation dans la fabrication d'éléments de filtre de cigarette, et procédés, systèmes et appareils associés
US10076135B2 (en) 2014-05-23 2018-09-18 Greenbutts Llc Biodegradable cigarette filter tow and method of manufacture

Also Published As

Publication number Publication date
DE1517265A1 (de) 1969-12-11
FR1462768A (fr) 1966-12-16
IT941496B (it) 1973-03-01
NL6517246A (fr) 1966-07-05
AT272913B (de) 1969-07-25
GB1117188A (en) 1968-06-19
CH454713A (fr) 1968-04-15
BE674702A (fr) 1966-07-04

Similar Documents

Publication Publication Date Title
US3370595A (en) Smoke filters
US3236244A (en) Tobacco smoke filter element
JP5398143B2 (ja) カーボンオントウ・フィルタを有するシガレット
JP5173815B2 (ja) フィルタ付き喫煙品
US5718250A (en) Low gas phase filter for cigarettes
US3327718A (en) Tobacco-smoke filters
US3349780A (en) Acetate filter elements containing carbon
EA004840B1 (ru) Сигарета и фильтр с последующим добавлением аромата
US2988088A (en) Cigarette
US3043736A (en) Method for making additive filters
US3461882A (en) Method of filtering tobacco smoke
US4619279A (en) Tobacco smoke filter
US3417758A (en) Filter elements and additives therefor
US2948282A (en) Fibrous tobacco smoke filter elements
US3724469A (en) Tobacco smoke filter
GB1354362A (en) Filter tow and tobacco smoke filters made there from
US3349779A (en) Cigarette filter element containing certain hexahydrotriazines for the selective removal of acrolein
US3802441A (en) Tobacco smoke filter additive
US3410282A (en) Filter medium for removing hydrogen cyanide from tobacco smoke
US3426763A (en) Tobacco smoke filter having a coated carbon additive
US3033212A (en) Tobacco smoke filter containing polyolefin cobweb additive
US3332427A (en) Product and process for filtering tobacco smoke
US3359990A (en) Cigarette filter element containing water-soluble monomeric hydrazides for the selective removal of aldehyde vapors
US3424173A (en) Filter element for selectively removing nicotine from tobacco smoke
US3417759A (en) Filter element for selectively removing nicotine from tobacco smoke