US2988088A - Cigarette - Google Patents

Cigarette Download PDF

Info

Publication number
US2988088A
US2988088A US448815A US44881554A US2988088A US 2988088 A US2988088 A US 2988088A US 448815 A US448815 A US 448815A US 44881554 A US44881554 A US 44881554A US 2988088 A US2988088 A US 2988088A
Authority
US
United States
Prior art keywords
cigarette
smoke
filter
resistance
tobacco
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
US448815A
Other languages
English (en)
Inventor
Milton O Schur
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.)
Olin Corp
Original Assignee
Olin 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 Olin Corp filed Critical Olin Corp
Priority to US448815A priority Critical patent/US2988088A/en
Priority to GB32669/54A priority patent/GB758429A/en
Priority to CH332794D priority patent/CH332794A/de
Application granted granted Critical
Publication of US2988088A publication Critical patent/US2988088A/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 OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter tips or filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces of cigars or cigarettes
    • A24D3/04—Tobacco smoke filters characterised by their shape or structure
    • A24D3/043—Tobacco smoke filters characterised by their shape or structure with ventilation means, e.g. air dilution

Definitions

  • MILTCN O. SCHUR (Law. 21/.
  • This invention relates generally to cigarettes and more particularly to an improved cigarette having a filter stub or tip for the tobacco smoke.
  • the filter noticeably increases the drag or draw on the cigarette when the smoker pulls a normal volume of air and smoke into his mouth during a puff. Consequently, the heretofore available filter tip cigarettes have not been entirely satisfactory because many smokers object to a cigarette which has a noticeably increased resistance or drag to the flow of smoke therethrough.
  • Another object of this invention is to improve the smoking characteristics of cigarettes having a filter tip.
  • Another object of this invention is to provide a means for reducing the quantity of harmful gaseous components, including acrolein, of the cigarette smoke as well as reducing the particulate constituents thereof before the smoke is delivered to the mouth of the smoker as the cigarette is consumed without seriously impairing the smoking characteristics of the cigarette.
  • Still another object of this invention is to provide a cigarette having an effective filter tip which imposes a resistance to gas fiow in the neighborhood of the resistance of a conventional cigarette not having a filter tip.
  • a further object is to provide a filter tipped cigarette having improved taste characteristics.
  • a more specific object of this invention is to provide a cigarette having a filter tip which has smoking characteristics comparable to the conventional cigarette not having a filter tip and which is capable of delivering smoke which contains less than the normal concentration of all components of cigarette smoke.
  • FIGURE 1 is a perspective view partially in section of one embodiment of this invention
  • FIGURE 2 is a perspective view partially in section of another embodiment of this invention.
  • FIGURE 3 illustrates in a perspective view, also partially in section, a third embodiment of this invention.
  • the objects of this invention are Patented June 13, 1961 attained by combining in a cigarette a filter tip and a means for admitting sufficient air into the cigarette adjacent the month end thereof to dilute the smoke by at least about 20 percent.
  • a series of orifices of predetermined number and size are provided in the wall of the cigarette and they may be located either in the cigarette wrapper which encloses the tobacco column adjacent the filter tip, or they may be located in the region of the filter tip or in a mouth piece attached to the filter tip.
  • a cigarette wrapper having a zone of a substantially greater porosity in the region of the filter tip than in the remainder thereof is utilized.
  • the wrapper may be of a composite structure, the portion in the region of the filter tip having a substantially open structure similar to conventional stencil tissue while the remainder of the wrapper is conventional cigarette wrapping paper.
  • This invention is predicated upon the discovery that the smoke passing into a smokers mouth from a filter tipped cigarette can be attenuated, Without detrimentally affecting the taste of the tobacco smoke, so as to compensate for the difference between the resistance of the filter tip to the passage of smoke therethrough and the resistance imposed by a tobacco column of similar length. Indeed, in most instances the taste of the smoke of the filter tipped cigarette is improved. In contradistinction, the reaction of the smoker of an ordinary untipped cigarette is unfavorably affected if the wrapper is perforated.
  • the size and number of the orifices in the filter tipped cigarette wall or the porosity of the zone adjacent the filter tip which gives optimum results will vary with the type of filter utilized, but for the best results, insofar as taste and improvement in smoking characteristics such as improvement in draw of the cigarette, is concerned, the porosity can be such as to result in the dilution of the smoke by at least about 20 percent.
  • the invention thus provides a means for greatly reducing the concentration of the various components of the tobacco smoke by combining a means for attenuating or diluting the smoke with air and additionally filtering the smoke to absorb and adsorb constituents therefrom.
  • the filter tip or stub can be composed of any absorbent material with or without adsorbents included therein but it is preferred that one of the more effective absorbent paper filter tips be utilized. Any material capable of adsorbing components from the tobacco smoke or reacting therewith such as, for example, activated charcoal, cuprous chloride, aluminum hydroxide or the like may be utilized. It is preferred, however, to use a combination of the porous zone provided by this invention and the filter tip disclosed in the co-pending application of Milton 0. Schur and James C. Rickards, Serial Number 400,072, now abandoned, filed December 23, 1953, or the filter tip of co-pending application of Milton 0. Schur, filed July 13, 1954, now US.
  • FIGURE 1 illustrates one embodiment of this invention in which cigarette 1 is composed of wrapper 2 enclosing tobacco 6 and filter tip 3.
  • Wrapper 2 is provided with a series of orifices '4 having a total area such that sufiicient air enters therethrough to compensate for the difference between the resistance to the flow of smoke imposed by the filter 3 and the resistance of a comparable length of tobacco 6.
  • filter 3 is formed in accordance with the method disclosed in the copending application Serial Number 400,072, referred to hereinbefore.
  • Such a filter tip ordinarily imposes a resistance to the flow of smoke equivalent to a column of water 32 millimeters high when the flow through the tip is 17.5 cc. per second.
  • the series of orifices 4 admit sufiicient air into the cigarette to compensate for the difference between this resistance of the filter tip and the resistance imposed by a similar length, for example, 13 centimeters, of conventional cigarette tobacco compressed to the density of the average cigarette.
  • FIGURE 2 a cigarette 1 containing tobacco 6 and filter 3, similar to that of FIGURE 1, enclosed in wrap- 'per 2 is shown with a firm paper mouth piece 5.
  • the series of orifices 4 having a diameter similar to that of the foregoing embodiment are provided in the mouth piece in such a position that they will not become covered by the lips of the smoker.
  • cigarette 1 containing tobacco 6 and filter 3 has been provided with a series of orifices 4 extending through wrapper 2 adjacent the filter.
  • the air passes directly into a filter tip 3 and is injected into the various passageways therethrough to compensate for the resistance imposed by the filter tip to the flow of smoke to such an extent that the cigarette can be smoked as easily as the conventional cigarette not having a filter tip.
  • the drag required to pull a given volume of air and smoke through the filter tip can be adjusted to be equivalent to the drag required to pull an equal volume of smoke through a conventional cigarette not having a filter tip. This is accomplished by providing the orifices 4 which introduce a second path, in parallel with the path through the rod of tobacco 6, for air to enter the cigarette adjacent its mouth end. Through control of the size and number of orifices 4, the resistance to flow in the cigarette 1 is decreased to the extent that the filter 3 would increase the over-all resistance of the cigarette had not the wrapper been perforated.
  • the resistance of the filter tipped cigarette be adjusted within a range such that it does not deviate by more than about 30 percent from the resistance of the conventional cigarette.
  • the size of the orifices 4 provided in the wrapper of any one of the embodiments thereof is preselected so that the resistance of the orifices is equal to the average resistance of a rod of tobacco 6 during the smoking of the cigarette, the volume of smoke drawn through the rod of tobacco 6 from the burning zone of the cigarette during a normal pull will average approximately one-half that of the smoke pulled through the conventional cigarette.
  • the conductance of the filter tip 3 would manifestly have to be equal to that of the sum of the average conductance of the tobacco rod 6 and the conductance of the orifices 4.
  • Filter tips in common use with a conductance of this order will retain only about 30% of the particulates in the smoke. Such tips during a normal puff increase the drag on a conventional cigarette during a normal pufi by more than about 40% Further, they remove or retain no significant quantities of the constituents of the gas phase of the smoke.
  • the cigarette of the present invention carrying a similar filter tip, but provided with the orifices of the example given above, delivers to the smoker during each normal pufi only about 50% as much of the gaseous constituents of the smoke as he would receive from a conventional cigarette without a filter tip.
  • the resistance of the lighted cigarette having the combination of a filter tip and orifices in the cigarette wrapper adjacent the filter is equivalent to a column of water about 70 mm. high which is substantially the same resistance as that of the average lighted ordinary commercially available cigarette not having a filter tip.
  • the cigarette provided by this invention provides a means for attenuating the particulate as well as the gaseous constituents of tobacco smoke and that moreover this objective is accomplished without materially increasing or decreasing the resistance of the cigarette to the flow of gases therethrough. That is, a cigarette having improved smoking characteristics, insofar as taste and reduction of harmful constituents in the smoke is concerned, is provided without at the same time introducing an undesirable characteristic.
  • the resistance of the filter tip at the month end of the cigarette will vary over a wide range, depending upon the construction of the filter tip used, it is seldom necessary to use a filter which imposes a resistance to the flow of gases therethrough greater than about 5 times the resistance of a column of cigarette tobacco of equal'length and compressed to the same extent as tobacco is compressed in a cigarette. It is preferred that the resistance of the filter tip or restriction be about 25 percent to about 75 percent that of the resistance of the original, untipped, unperforated cigarette when first lighted. For best results, it is preferred that the resistance of the filter tipped cigarette to the flow of smoke therethrough not deviate more than about 30 percent from the resistance of typical untipped cigarette.
  • the resistance imposed by a filter of a given construction has been found to vary only a slightly extentfrom one filter stub to another. It is, therefore, possible to determine by experiment the average resistance imposed by a filter of a particular construction and then to perforate the wrapper while the cigarette is in the testing apparatus until the resistance to the flow of smoke is reduced to the desired resistance. After the proper size and number of orifices has thus been determined, similar perforations can then be placed in cigarettes as they are manufactured to provide cigarettes embodying this invention.
  • the desired resistance is substantially equal to that of a commercially available cigarette not having a filter tipor, in other words,-in typical cigarettes equivalent to a column of water about 70 mm. high when gas is flowing through the lighted cigarette at the rate of 17 /2 cc. per second.
  • a less efiective filter tip is used on the cigarette of the present invention.
  • this can be accomplished Without lowering the resistance to flow through the tip it the filter is comprised of crumpled tissue paper prepared from highly beaten pulp.
  • the retentivity of the stub for particulates approaches zero, and the stub thereby becomes no more than a restriction, the extent of the reduction in concentration of the particulates in the smoke manifestly approaches that of the gas phase until, in the limit, they become equal.
  • the smoke thus collected was carefully dissolved in a solvent consisting of 3 parts of ethyl alcohol and 2 parts of toluol by volume, the solution transferred to a weighing bottle, the solvent evaporated at room temperature, the residue heated overnight at 95 C., and weighed. The residue amounted to 25.6 milligrams per cigarette.
  • the weight of smoke collected averaged 16.3 mgms. per cigarette.
  • the weight of acrolein found in the smoke passing into the smoke collector averaged 0.025 mgm.
  • the filter tip removed 36% of the particulates and none of the gaseous acrolein.
  • the orifices pricked through the cigarette wrapper not only reduced the drag of the filtertipped cigarettes from an initial value of 86 mm. down to 70 mm., i.e., to that of the untipped cigarette of Experiment 1, but lowered the particulates passing into the collector 58%, as compared with the untipped cigarette, and the amount of acrolein by 28%.
  • the filter was comprised of tissue prepared from highly beaten cellulose fibers. Its resistance to the flow of air and smoke was the same as in Experiment 2.
  • the filter tip removed only 15% of the particulates from the smoke, and since there were no by-pass holes pricked through the wrapper, the quantity of acrolein in the smoke was the same as in the case of an untipped cigarette.
  • Experiment 6 In Experiment 6, a filter tip of the same resistance as in Experiment 2 was used. It was comprised of paper made from pulp beaten to an intermediate extent and containing 4.7% of activated charcoal. The weight ofparticulates entering the smoke collector was found to be 21% less than that of the untipped cigarette of Experiment 1;but because of the presence of activated charcoal in the filter tip, the quantity of acrolein in the smoke was less by 26%.
  • R resistance of the burning tip of the cigarette to the flow of air and smoke.
  • R" resistance of the non-burning portion of the rod of tobacco.
  • R resistance of the rod of tobacco including burning tip.
  • R the resistance of the orifices in the cigarette wrapper in the region of the filter Itip.
  • R resistance of the filter tip.
  • R resistance of R and R which are in parallel.
  • L length of the column of tobacco in millimeters.
  • N number of puffs necessary to consume a 47 mm.
  • F cc. flow of air and smoke through the tobacco rod per second.
  • the filter is capable of retaining 36% of the particulates, by weight, then the combined effect of such retention and of the diluting effect of the air entering the by-pass orifices for the case under calculation should reduce the amount of particulates entering the smoke collector by
  • a typical domestic cigarette such as was used in Experiment 1, described above, is smoked in the smoking machine, it is found that 9.5 cycles, counting from the start of the first puif, are required, on the average, to consume the cigarette from an initial length of 70 mm. to a butt length of 23 mm, i.e. to consume (704.3) or 47 mm. of tobacco rod. This length weighs, 0n the average,
  • a cigarette comprising a unitary outer wrapper for enveloping its contents and defining the body portion thereof, said wrapper having therein a section of tobacco of constant length, and a mouth-end section comprising a separable non-tobacco filter, said latter section being distinct from said first section by a clearly defined peripheral line of perforations on the surface of the said wrapper, said wrapper extending the full length of the tobacco section and filter section.

Landscapes

  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)
US448815A 1954-08-10 1954-08-10 Cigarette Expired - Lifetime US2988088A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US448815A US2988088A (en) 1954-08-10 1954-08-10 Cigarette
GB32669/54A GB758429A (en) 1954-08-10 1954-11-11 Improvements in or relating to cigarettes
CH332794D CH332794A (de) 1954-08-10 1954-11-29 Verfahren zur Herstellung einer Filterzigarette und nach diesem Verfahren hergestellte Filterzigarette

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US448815A US2988088A (en) 1954-08-10 1954-08-10 Cigarette

Publications (1)

Publication Number Publication Date
US2988088A true US2988088A (en) 1961-06-13

Family

ID=23781795

Family Applications (1)

Application Number Title Priority Date Filing Date
US448815A Expired - Lifetime US2988088A (en) 1954-08-10 1954-08-10 Cigarette

Country Status (3)

Country Link
US (1) US2988088A (de)
CH (1) CH332794A (de)
GB (1) GB758429A (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279475A (en) * 1964-01-09 1966-10-18 Trans World Raysol Ltd Filter tipped cigarettes
US3283762A (en) * 1964-05-14 1966-11-08 Michael S Kissel Aeratable cigarette
US3324862A (en) * 1964-08-31 1967-06-13 Simone Bessie De Smoking device
US3394708A (en) * 1965-07-08 1968-07-30 Grassi Elio Cigarette with air dilution means
US3396733A (en) * 1966-03-23 1968-08-13 Lorillard Co P Cigarette tip
US3451887A (en) * 1963-03-22 1969-06-24 Eastman Kodak Co Blends of cellulose acetate and polyolefin fibers in tow form
DE2251903A1 (de) * 1971-10-27 1973-05-03 British American Tobacco Co Ventilierte filterzigarette
US3800805A (en) * 1971-10-11 1974-04-02 Brown & Williamson Tobacco Corp Smoking articles
US3924643A (en) * 1971-10-27 1975-12-09 Brown & Williamson Tobacco Corp Ventilated filter tip cigarette
US4035220A (en) * 1973-10-09 1977-07-12 Brown & Williamson Tobacco Corporation Method for making porous filter tip
US4112154A (en) * 1977-09-02 1978-09-05 Olin Corporation Method for obtaining uniform porosity in printed inherently porous cigarette tipping papers
DE3005793A1 (de) * 1980-02-15 1981-08-20 Schoeller & Hoesch KG, 7562 Gernsbach Poroeses filterpapier, sowie zwischenprodukt und verfahren zu seiner herstellung
US4294265A (en) * 1980-04-04 1981-10-13 Philip Morris Incorporated Filter cigarette with inlet vent zones
US4295478A (en) * 1979-04-11 1981-10-20 Rjr Archer, Inc. Composite tipping structure for use on an air-ventilated cigarette and method of manufacturing same
US4411280A (en) * 1981-09-11 1983-10-25 Celanese Corporation Ventilated thermoplastic polymer foam filter rods
US4452259A (en) * 1981-07-10 1984-06-05 Loews Theatres, Inc. Smoking articles having a reduced free burn time

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124143A (en) * 1964-03-10 Smoking accessories
GB864247A (en) * 1958-04-16 1961-03-29 Olin Mathieson Improvements in or relating to cigarettes
US3043314A (en) * 1958-09-15 1962-07-10 Frank T Bartolomeo Smoking articles
US2981261A (en) * 1958-10-23 1961-04-25 Rupert John Peter Cigarette
US2980116A (en) * 1958-11-17 1961-04-18 Olin Mathieson Cigarette
US3482579A (en) * 1964-02-27 1969-12-09 Imp Tobacco Co Ltd Filter cigarette having a permeable band wrap
US3410275A (en) * 1965-03-30 1968-11-12 Irwin W. Tucker Cigarette filter
US3473535A (en) * 1968-10-07 1969-10-21 Eldon E Stahly Treatment of tobacco smoke to reduce metal carbonyl content thereof

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US253296A (en) * 1882-02-07 Francis s
US439004A (en) * 1890-10-21 Edward marshall harris
US552711A (en) * 1896-01-07 kaldenberg
US729680A (en) * 1901-08-07 1903-06-02 Wilhelm Schwartz Nicotin-absorber.
US1868469A (en) * 1930-04-19 1932-07-19 Hurshel H Broadway Smoking apparatus
US2085293A (en) * 1936-05-27 1937-06-29 Hildegarde M Buffington Smoker's article
US2269995A (en) * 1940-04-26 1942-01-13 Trane Raymond Smoking article
US2594680A (en) * 1948-12-04 1952-04-29 George W Rehfeld Smoking device
GB706624A (en) * 1949-12-06 1954-03-31 Elie Prodromos Aghnides Improvements in or relating to cigarettes
US2693193A (en) * 1950-04-13 1954-11-02 Pelletier Louis Gerard Cigarette holder
US2707308A (en) * 1948-12-10 1955-05-03 British Celanese Method of making a filter element

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US253296A (en) * 1882-02-07 Francis s
US439004A (en) * 1890-10-21 Edward marshall harris
US552711A (en) * 1896-01-07 kaldenberg
US729680A (en) * 1901-08-07 1903-06-02 Wilhelm Schwartz Nicotin-absorber.
US1868469A (en) * 1930-04-19 1932-07-19 Hurshel H Broadway Smoking apparatus
US2085293A (en) * 1936-05-27 1937-06-29 Hildegarde M Buffington Smoker's article
US2269995A (en) * 1940-04-26 1942-01-13 Trane Raymond Smoking article
US2594680A (en) * 1948-12-04 1952-04-29 George W Rehfeld Smoking device
US2707308A (en) * 1948-12-10 1955-05-03 British Celanese Method of making a filter element
GB706624A (en) * 1949-12-06 1954-03-31 Elie Prodromos Aghnides Improvements in or relating to cigarettes
US2693193A (en) * 1950-04-13 1954-11-02 Pelletier Louis Gerard Cigarette holder

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3451887A (en) * 1963-03-22 1969-06-24 Eastman Kodak Co Blends of cellulose acetate and polyolefin fibers in tow form
US3279475A (en) * 1964-01-09 1966-10-18 Trans World Raysol Ltd Filter tipped cigarettes
US3283762A (en) * 1964-05-14 1966-11-08 Michael S Kissel Aeratable cigarette
US3324862A (en) * 1964-08-31 1967-06-13 Simone Bessie De Smoking device
US3394708A (en) * 1965-07-08 1968-07-30 Grassi Elio Cigarette with air dilution means
US3396733A (en) * 1966-03-23 1968-08-13 Lorillard Co P Cigarette tip
US3800805A (en) * 1971-10-11 1974-04-02 Brown & Williamson Tobacco Corp Smoking articles
US3805800A (en) * 1971-10-27 1974-04-23 Brown & Williamson Tobacco Corp Ventilated filter tip cigarette
DE2251903A1 (de) * 1971-10-27 1973-05-03 British American Tobacco Co Ventilierte filterzigarette
US3924643A (en) * 1971-10-27 1975-12-09 Brown & Williamson Tobacco Corp Ventilated filter tip cigarette
US4035220A (en) * 1973-10-09 1977-07-12 Brown & Williamson Tobacco Corporation Method for making porous filter tip
US4112154A (en) * 1977-09-02 1978-09-05 Olin Corporation Method for obtaining uniform porosity in printed inherently porous cigarette tipping papers
US4295478A (en) * 1979-04-11 1981-10-20 Rjr Archer, Inc. Composite tipping structure for use on an air-ventilated cigarette and method of manufacturing same
DE3005793A1 (de) * 1980-02-15 1981-08-20 Schoeller & Hoesch KG, 7562 Gernsbach Poroeses filterpapier, sowie zwischenprodukt und verfahren zu seiner herstellung
US4294265A (en) * 1980-04-04 1981-10-13 Philip Morris Incorporated Filter cigarette with inlet vent zones
US4452259A (en) * 1981-07-10 1984-06-05 Loews Theatres, Inc. Smoking articles having a reduced free burn time
US4411280A (en) * 1981-09-11 1983-10-25 Celanese Corporation Ventilated thermoplastic polymer foam filter rods

Also Published As

Publication number Publication date
GB758429A (en) 1956-10-03
CH332794A (de) 1958-09-30

Similar Documents

Publication Publication Date Title
US2988088A (en) Cigarette
US3046994A (en) Ventilated cigarette
US5115823A (en) Flavor-enhancing smoking filter
RU149263U1 (ru) Фильтр для курительного изделия
US3236244A (en) Tobacco smoke filter element
US5131416A (en) Cigarette
US4331166A (en) Cigarette
US12484611B2 (en) Firm filter for aerosol-generating article
JPS63287473A (ja) 紙巻タバコ
JPH031947B2 (de)
IE52461B1 (en) Tipping assembly for elongate smoking article
US4088142A (en) Cigarettes
US6422244B1 (en) Filter for a cigarette and filter cigarette
CN104770879A (zh) 一种带有雾化烟气释放和混合功能的卷烟嘴过滤装置
KR20230076061A (ko) 가열식 궐련
US4292984A (en) Filter for cigarette smoke
RU148462U1 (ru) Фильтр для курительного изделия
GB2175190A (en) Cigarette mouthpiece
CA1299960C (en) Method of fabricating an all-tobacco cigarette controlling tar delivery and an all-tobacco cigarette
US5076294A (en) Filter cigarette
JP2001120249A (ja) たばこフィルター
US20210051997A1 (en) Firm filter for aerosol-generating article
US3043314A (en) Smoking articles
US5105839A (en) Smoking articles
JPH0453507B2 (de)