EP0474940A1 - Concentric smoking filter having discrete tow and web filter media - Google Patents
Concentric smoking filter having discrete tow and web filter media Download PDFInfo
- Publication number
- EP0474940A1 EP0474940A1 EP90313555A EP90313555A EP0474940A1 EP 0474940 A1 EP0474940 A1 EP 0474940A1 EP 90313555 A EP90313555 A EP 90313555A EP 90313555 A EP90313555 A EP 90313555A EP 0474940 A1 EP0474940 A1 EP 0474940A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- smoking
- plug
- draw
- resistance
- 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.)
- Granted
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
- A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
- A24D3/10—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent of cellulose or cellulose derivatives
-
- 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
- A24D3/04—Tobacco smoke filters characterised by their shape or structure
-
- 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
-
- 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
Abstract
Description
- This invention relates to smoking filters, and particularly to concentric smoking filters. More particularly, this invention relates to concentric smoking filters having tow and web filter media portions arranged concentrically.
- Most smoking filters, particularly cigarette filters, sold commercially as part of cigarettes consist of a cylindrical rod or "plug" of a "tow" of plasticized cellulose acetate fibers. Some filters are variants of the standard filter, having recessed mouth ends, or being made of two plugs placed end-to- end with a space in between, the space being either empty or filled with another material such as charcoal. It is also known to provide such filters having multiple plugs abutting one another, the different plugs differing in density or other characteristics.
- Similarly, it is known to provide filtering media other than cellulose acetate. One such medium is an appropriate sheet or web material. The web material, which is gathered into a cylindrical plug, can be paper or any other web material, including cellulose acetate in sheet form. When such web materials are used as filters, they are frequently corrugated before being gathered. Paper webs may also be creped to improve tensile strength.
- Some of these different materials and different constructions have been combined. For example, it is known to provide filters having two or more abutting plugs, at least one of which is cellulose acetate tow, and at least one of which is a web material.
- Finally, it is known to provide "concentric filters" in which two different forms of cellulose acetate tow -- differing, e.g., in density -- are formed in to a filter. One cellulose acetate tow forms a cylindrical "core", while the other tow forms an annular peripheral layer.
- Smoking filters are characterized by various parameters, including pressure drop, which is referred to as resistance-to-draw ("RTD") and usually measured as the height of a column of water, and efficiency, which is measured as the percentage of the total particulate matter ("TPM") in the unfiltered smokestream that is trapped by the filter. The RTD of a filter affects how smokers perceive the filter in terms of how hard they must draw on it to receive a desired amount of smoke, while the filter efficiency controls the amount of TPM delivered in the smoke.
- It has been found that while web filters, and particularly paper filters, are more efficient than tow filters, the web material, especially paper, adds an off taste to the smoke which decreases smoker satisfaction. In addition, the appearance of the visible deposited smoke components on the end of a paper filter is much less regular, and more spotty, than on a cellulose acetate tow filter, again affecting the aesthetic impact on the smoker. This difference in appearance is believed to result from the channelling of deposited material in the channels formed by the corrugation and gathering of the web during plug making.
- As consumer preferences tend toward lower delivery cigarettes, the need for higher efficiency filters, which allow lower delivery without increased filter RTD, increases. However, the higher efficiency of paper filters could not previously be taken advantage of because of the negative consumer impacts of paper filters.
- It would be desirable to be able to provide a high efficiency filter which produced low delivery while also delivering acceptable taste, RTD and other aesthetic impacts.
- It is an object of this invention to provide a high efficiency filter which produces low delivery while also delivering acceptable taste, RTD and other aesthetic impacts.
- In accordance with this invention, there is provided a smoking filter comprising a first filter plug having a central core of a first filter material and a peripheral layer of a second filter material surrounding the central core. One of the first and second filter materials is cellulose acetate tow and the other of the first and second filter materials is a gathered corrugated web material. When the filter is attached to a smoking article and delivers, when the smoking article is smoked, a particular level of total particulate matter, the taste of the smoking article is a taste associated with a level of total particulate matter higher than that particular level.
- The above and other objects and advantages of the invention will be apparent upon consideration of the following detailed description, taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout, and in which:
- FIG. 1 is a mouth end perspective view of a cigarette having a first embodiment of a filter according to the present invention;
- FIG. 2 is a radial cross-sectional view of the filter of FIG. 1;
- FIG. 3 is a mouth end perspective view of a cigarette having a second embodiment of a filter according to the present invention;
- FIG. 4 is a radial cross-sectional view of the filter of FIG. 3;
- FIG. 5 is a mouth end perspective view of a cigarette having a third embodiment of a filter according to the present invention; and
- FIG. 6 is a mouth end perspective view of a cigarette having a fourth embodiment of a filter according to the present invention.
- In accordance with the present invention, it has unexpectedly been found that when a concentric filter is made with paper or other web material in the core, and cellulose acetate tow in the periphery, or vice-versa, not only is high filtration efficiency achieved without the introduction of an off taste from the paper, but a cigarette with low TPM delivery can be produced which has the taste of a cigarette with a higher TPM delivery.
- As shown in FIGS. 1 and 2,
cigarette 10 includes atobacco rod 11 and a first preferred embodiment of afilter 12 according to this invention. Tobaccorod 11 is wrapped inconventional wrapper 13, whilefilter 12 is wrapped byconventional tipping 14.Filter 12 includes cellulose acetate towperipheral layer 20 andcentral paper core 21. Cellulose acetateperipheral layer 20 is a conventional cellulose acetate tow, preferably wrapped byporous plug wrap 22, although self-supporting filter rod technology, such as steam bonding or spray coating of the outer surface ofperipheral layer 20, can be used to make a filter that need not be wrapped, if desired.Paper core 21 is a paper web that has been corrugated and gathered into cylindrical form and wrapped withplug wrap paper 23. -
Plug wrap 23 improves the processibility ofcore 21 as well as its aesthetic appearance, and also helps to assure substantially perfect concentricity. Flavorants or other additives, such as soluble tobacco components, could be applied toplug wrap 23 to enhance the subjective impact of the filtered smoke. A similar result might be achieved by formingplug wrap 23 from a tobacco-containing material, such as reconstituted tobacco sheet.Plug wrap 23 is preferably porous, to allow smoke and air to freely move radially betweenperipheral layer 20 andcore 21. At the same time, the presence ofplug wrap 23 helps prevent channelling of smoke along the interface betweenperipheral layer 20 andcore 21. - The most preferred embodiment of
filter 12 has a circumference of about 24.45 mm and an average weight of about 258 mg. The cross-sectional area ofcore 21 preferably makes up about 60% of the total cross-sectional area offilter 12.Filter 12 preferably has an RTD of between about 130 mm W.G. and about 160 mm W.G., with the RTD ofcentral core 21 being between about 350 mm W.G. and about 450 mm W.G.. More preferably,filter 12 has an RTD of about 146 mm W.G., with the RTD ofcentral core 21 being about 400 mm W.G. - In the particularly preferred embodiment, the cellulose acetate tow of
peripheral layer 20 is preferably an 8.0/30000 cellulose acetate tow having a denier per fiber of 8, a total denier of 30,000, and a "Y" cross-sectional shape. The web ofcore 21 is preferably a 100% cellulose semi-creped softwood pulp paper with 10% crosswise creping for added tensile strength. Such a paper is available from Tela Papierfabrik AG, of Balsthal, Switzerland. -
Cigarette 10 is preferably ventilated to between about 65% and about 75% ventilation, and more preferably about 67% ventilation, withappropriate ventilation holes 15 provided in tipping 14. If the surface offilter 12 is not air permeable, appropriate holes would also be provided infilter 12. - FIGS. 3 and 4 show a
cigarette 30 having a second preferred embodiment offilter 31 similar in construction tofilter 12, except thatcore 40 is a tow material andperipheral layer 41 is a web material. Similarly, in this embodiment plug wrap 42 is necessary to contain the web material ofperipheral layer 41, while plug wrap or otherpermeable wrap 43 aroundtow core 40 is optional, astow core 40 could be made using self-supporting filter rod technology, as above. - The most preferred embodiment of
filter 31 has a circumference of about 24.45 mm and an average weight of about 240 mg. The cross-sectional area ofcore 40 preferably makes up about 60% of the total cross-sectional area offilter 31.Filter 31 preferably has an RTD of between about 165 mm W.G. and about 195 mm W.G., with the RTD ofcentral core 40 being between about 285 mm W.G. and about 385 mm W.G. More preferably,filter 31 has an RTD of about 182 mm W.G., with the RTD ofcentral core 40 being about 334 mm W.G. - In this embodiment, the cellulose acetate tow of
core 40 is preferably a 1.6/35000 cellulose acetate tow having a denier per fiber of 1.6, a total denier of 35,000, and a "Y" cross-sectional shape. The web ofperipheral layer 41 is preferably the same 100% cellulose semi-creped softwood pulp paper, with 10% crosswise creping for added tensile strength, that is used incore 21 offilter 12. -
Cigarette 30 is preferably ventilated to between about 65% and about 75% ventilation, and more preferably about 67% ventilation, with appropriate ventilation holes 15 provided in tipping 14, as incigarette 10. - FIG. 5 shows a
cigarette 50 having a third preferred embodiment of a filter 51 according to the invention. Filter 51 is a so-called "dual" filter, made up of twoabutting filter segments 52, 53. Filter segment 52, which isadjacent tobacco rod 11, is a concentric filter as discussed above, in which one of core 54 andperipheral layer 55 is of a web material and the other of core 54 andperipheral layer 55 is of a tow material.Filter segment 53, which is at the mouth end, is a conventional tow filter, such as a cellulose acetate filter, and is provided primarily for cosmetic purposes. Nevertheless,segment 53 has filtration and RTD characteristics, and segment 52 must be adjusted so that the overall filter 51 has the desired characteristics. - In a preferred form of this embodiment, segment 52 is constructed like
filter 12, but has a length of only 18-20 mm, whilesegment 53 is a 7-9 mm long plug of 2.6/42000 cellulose acetate for tow having a denier per fiber of 2.6, a total denier of 42,000, and a "Y" cross-sectional shape. Total filter RTD is between about 125 mm W.G. and about 175 mm W.G., preferably about 141 mm W.G. The RTD ofsegment 53 is between about 15 mm W.G. and about 45 mm W.G., preferably about 36 mm W.G. The RTD of segment 52 is between about 85 mm W.G. and about 175 mm W.G., preferably about 93 mm W.G. The RTD of the paper core 54 of segment 52 is between about 250 mm W.G. and about 450 mm W.G., preferably about 267 mm. W.G.Cigarette 50 made with this embodiment of filter 51 is ventilated to between about 65% and about 75% ventilation, preferably about 71% ventilation, with appropriate ventilation holes 15 in tipping 14. - FIG. 6 shows a
cigarette 60 having a fourth embodiment of a filter 61 according to the invention. Filter 61 is a recessed filter, made up offilter segment 62 recessed into tipping 14 at 63.Filter segment 62, which isadjacent tobacco rod 11, is a concentric filter as discussed above, in which one ofcore 64 andperipheral layer 65 is of a web material and the other ofcore 64 andperipheral layer 65 is of a tow material. - The filter parameters discussed herein are given for 85 mm cigarettes. It is to be understood that filters according to the present invention can also be used with longer cigarettes. If a longer cigarette is provided, the filter parameters would have to be adjusted, in accordance with the knowledge of those skilled in the art.
- A filter according to the most preferred embodiment discussed above in connection with FIGS. 1 and 2, except that the tow in the peripheral layer was an 8.0/25000 cellulose acetate tow having a denier per fiber of 8.0 and a total denier of 25000, was prepared and mated to an "ultra-light" tobacco rod having the following characteristics:
- Tobacco
- 487 mg
- Total RTD
- 107 mm W.G.
- Filter RTD
- 146 mm W.G.
- Ventilation
- 67%
- Tipping length
- 32.0 mm
-
- The cigarette, which generates 1.5 mg of "tar", was also smoked by expert smokers, who reported that the cigarette had the taste of a cigarette that generates 4-5 mg of "tar". At 67% ventilation, the filter has an efficiency of about 76%. If there had been no ventilation, the efficiency would have been about 61 %.
- The cigarette also exhibited a pattern of visible deposition of filtrate on the end of the filter much more like a tow filter as opposed to a web filter, even though most of the filtrate was deposited on the web core. This is believed to be the result of the smoke being forced into
core 21 as the ventilation air is introduced atholes 15, and then trying to spread back intoperipheral tow layer 20 throughpermeable wrapper 23. - A filter according to the preferred form of the embodiment of FIG. 5 was prepared and mated to an "ultra-light" tobacco rod having the following characteristics:
- Tobacco
- 429 mg
- Total RID
- 93 mm W.G.
- Filter RID
- 141 mm W.G.
- Ventilation
- 71%
- Tipping length
- 32 mm
-
- As in the case of Example I, this cigarette was smoked by expert smokers who reported that the cigarette had the taste of a cigarette that generates 4-5 mg of "tar".
- The filter of this invention will improve the taste of low delivery cigarettes. It is also possible that the filter of this invention may offer similar performance at higher deliveries. For example, a medium delivery cigarette may be perceived as a full-flavor cigarette.
- Thus it is seen that a high efficiency filter which produces low delivery while also delivering acceptable taste and other aesthetic impacts is provided. One skilled in the art will appreciate that the present invention can be practiced by other than the described embodiments, which are presented for purposes of illustration and not of limitation, and the present invention is limited only by the claims which follow.
Claims (28)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US57187890A | 1990-08-24 | 1990-08-24 | |
US571878 | 1990-08-24 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0474940A1 true EP0474940A1 (en) | 1992-03-18 |
EP0474940B1 EP0474940B1 (en) | 1994-12-14 |
EP0474940B2 EP0474940B2 (en) | 1999-10-06 |
Family
ID=24285429
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90313555A Expired - Lifetime EP0474940B2 (en) | 1990-08-24 | 1990-12-13 | Concentric smoking filter having discrete tow and web filter media |
Country Status (17)
Country | Link |
---|---|
EP (1) | EP0474940B2 (en) |
JP (1) | JP2767322B2 (en) |
KR (1) | KR0175139B1 (en) |
AT (1) | ATE115369T1 (en) |
AU (1) | AU635095B2 (en) |
CA (1) | CA2031727C (en) |
DE (1) | DE69015185T3 (en) |
DK (1) | DK0474940T4 (en) |
ES (1) | ES2066157T5 (en) |
FI (1) | FI94385C (en) |
GR (2) | GR3015326T3 (en) |
HK (1) | HK162995A (en) |
HU (1) | HU212772B (en) |
NO (1) | NO176464C (en) |
PL (1) | PL166314B1 (en) |
RU (1) | RU1836040C (en) |
TR (1) | TR25717A (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0608047A2 (en) * | 1993-01-19 | 1994-07-27 | Philip Morris Products Inc. | Concentric smoking filter having cellulose acetate tow periphery and carbon-particle-loaded web filter core |
EP0638248A1 (en) * | 1993-08-12 | 1995-02-15 | Philip Morris Products Inc. | Methods and apparatus to make concentric filters composed of two or more materials |
EP0648435A1 (en) * | 1993-10-19 | 1995-04-19 | British-American Tobacco Company Limited | Smoking articles |
US5622190A (en) * | 1990-08-24 | 1997-04-22 | Philip Morris Incorporated | Concentric smoking filter having cellulose acetate tow periphery and carbon-particle-loaded web filter core |
US5746230A (en) * | 1990-08-24 | 1998-05-05 | Philip Morris Incorporated | Concentric smoking filter having discrete tow and web filter media |
EP0875160A1 (en) * | 1997-04-30 | 1998-11-04 | British-American Tobacco (Germany) GmbH | Ventilated filter cigarette with a coaxial filterelement |
EP0880904A1 (en) | 1997-05-30 | 1998-12-02 | British-American Tobacco (Germany) GmbH | Ultra-light coaxial cigarette with a multi-section filter |
WO2001064061A1 (en) * | 2000-03-01 | 2001-09-07 | Reemtsma Cigarettenfabriken Gmbh | Item for smoking |
WO2009156269A1 (en) * | 2008-06-24 | 2009-12-30 | British American Tobacco (Investments) Limited | Filter for a smoking article |
US8550092B2 (en) | 2007-07-17 | 2013-10-08 | British American Tobacco (Investments) Limited | Filter |
CN104188106A (en) * | 2014-08-28 | 2014-12-10 | 云南中烟工业有限责任公司 | Cigarette filter tip with high interception efficiency and application |
EP3643185A4 (en) * | 2017-06-19 | 2021-05-26 | Japan Tobacco, Inc. | Smoking article filter and production method therefor |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EE200000264A (en) * | 1997-11-13 | 2001-06-15 | H.F. & Ph.F. Reemtsma Gmbh | Reduced gas phase cigarette |
GB0816933D0 (en) * | 2008-09-16 | 2008-10-22 | British American Tobacco Co | Filter for a smoking article |
CN101999755A (en) * | 2010-12-17 | 2011-04-06 | 南通烟滤嘴有限责任公司 | Filter rod with coaxial paper cores |
BR112015021619A8 (en) | 2013-03-28 | 2019-11-19 | Philip Morris Products Sa | filter for smoking article and smoking article |
KR102391290B1 (en) * | 2020-04-22 | 2022-04-26 | 주식회사 케이티앤지 | Mouthpiece for smoking aritcle, smoking article and smoking article assembly and smoking article package including the same |
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US3396061A (en) * | 1964-06-01 | 1968-08-06 | Celanese Corp | Smoke filters |
DE2558004A1 (en) * | 1975-10-30 | 1977-05-12 | Liggett & Myers Inc | CIGARETTE FILTER, METHOD AND DEVICE FOR ITS MANUFACTURING |
FR2368905A1 (en) * | 1976-10-28 | 1978-05-26 | Olin Corp | AIRY FLAVORED CIGARETTE |
US4355995A (en) * | 1979-03-27 | 1982-10-26 | American Filtrona Corporation | Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same |
FR2518374A1 (en) * | 1981-12-18 | 1983-06-24 | Filtrona Ltd | VENTILATED FILTER WITH NON-HOMOGENEOUS STRUCTURE FOR TOBACCO SMOKE |
DE3207683A1 (en) * | 1982-03-03 | 1983-09-15 | B.A.T. Cigaretten-Fabriken Gmbh, 2000 Hamburg | Filter |
FR2524274A1 (en) * | 1982-04-05 | 1983-10-07 | Filtrona Ltd | CIGARETTE FILTER |
EP0321740A1 (en) * | 1987-12-22 | 1989-06-28 | British-American Tobacco (Germany) GmbH | Coaxial cigarette |
EP0378788A1 (en) * | 1989-01-17 | 1990-07-25 | B.A.T. Cigarettenfabriken GmbH | Coaxial filter cigarette |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU4119078A (en) | 1977-11-18 | 1980-05-08 | Philip Morris Inc | Filter system |
US4291711A (en) * | 1979-03-27 | 1981-09-29 | American Filtrona Corporation | Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same |
-
1990
- 1990-12-05 AU AU67748/90A patent/AU635095B2/en not_active Ceased
- 1990-12-07 CA CA002031727A patent/CA2031727C/en not_active Expired - Fee Related
- 1990-12-11 FI FI906092A patent/FI94385C/en not_active IP Right Cessation
- 1990-12-13 DE DE69015185T patent/DE69015185T3/en not_active Expired - Fee Related
- 1990-12-13 EP EP90313555A patent/EP0474940B2/en not_active Expired - Lifetime
- 1990-12-13 DK DK90313555T patent/DK0474940T4/en active
- 1990-12-13 AT AT90313555T patent/ATE115369T1/en not_active IP Right Cessation
- 1990-12-13 ES ES90313555T patent/ES2066157T5/en not_active Expired - Lifetime
- 1990-12-18 PL PL90288311A patent/PL166314B1/en unknown
- 1990-12-20 HU HU908366A patent/HU212772B/en not_active IP Right Cessation
- 1990-12-26 KR KR1019900021735A patent/KR0175139B1/en not_active IP Right Cessation
- 1990-12-26 RU SU904894124A patent/RU1836040C/en active
- 1990-12-26 TR TR90/1210A patent/TR25717A/en unknown
- 1990-12-26 JP JP2414611A patent/JP2767322B2/en not_active Expired - Fee Related
- 1990-12-28 NO NO905639A patent/NO176464C/en unknown
-
1995
- 1995-03-07 GR GR950400504T patent/GR3015326T3/en unknown
- 1995-10-19 HK HK162995A patent/HK162995A/en not_active IP Right Cessation
-
1999
- 1999-12-15 GR GR990403230T patent/GR3032144T3/en unknown
Patent Citations (9)
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US3396061A (en) * | 1964-06-01 | 1968-08-06 | Celanese Corp | Smoke filters |
DE2558004A1 (en) * | 1975-10-30 | 1977-05-12 | Liggett & Myers Inc | CIGARETTE FILTER, METHOD AND DEVICE FOR ITS MANUFACTURING |
FR2368905A1 (en) * | 1976-10-28 | 1978-05-26 | Olin Corp | AIRY FLAVORED CIGARETTE |
US4355995A (en) * | 1979-03-27 | 1982-10-26 | American Filtrona Corporation | Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same |
FR2518374A1 (en) * | 1981-12-18 | 1983-06-24 | Filtrona Ltd | VENTILATED FILTER WITH NON-HOMOGENEOUS STRUCTURE FOR TOBACCO SMOKE |
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EP0321740A1 (en) * | 1987-12-22 | 1989-06-28 | British-American Tobacco (Germany) GmbH | Coaxial cigarette |
EP0378788A1 (en) * | 1989-01-17 | 1990-07-25 | B.A.T. Cigarettenfabriken GmbH | Coaxial filter cigarette |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5622190A (en) * | 1990-08-24 | 1997-04-22 | Philip Morris Incorporated | Concentric smoking filter having cellulose acetate tow periphery and carbon-particle-loaded web filter core |
US5746230A (en) * | 1990-08-24 | 1998-05-05 | Philip Morris Incorporated | Concentric smoking filter having discrete tow and web filter media |
EP0608047A3 (en) * | 1993-01-19 | 1994-11-17 | Philip Morris Prod | Concentric smoking filter having cellulose acetate tow periphery and carbon-particle-loaded web filter core. |
EP0608047A2 (en) * | 1993-01-19 | 1994-07-27 | Philip Morris Products Inc. | Concentric smoking filter having cellulose acetate tow periphery and carbon-particle-loaded web filter core |
EP0638248A1 (en) * | 1993-08-12 | 1995-02-15 | Philip Morris Products Inc. | Methods and apparatus to make concentric filters composed of two or more materials |
EP0648435A1 (en) * | 1993-10-19 | 1995-04-19 | British-American Tobacco Company Limited | Smoking articles |
WO1995010951A1 (en) * | 1993-10-19 | 1995-04-27 | Brown & Willamson Tobacco Corporation | Smoking articles |
US5979459A (en) * | 1997-04-30 | 1999-11-09 | Brown & Williamson Tobacco Corporation | Ventilated filter cigarette with a coaxial filter element |
EP0875160A1 (en) * | 1997-04-30 | 1998-11-04 | British-American Tobacco (Germany) GmbH | Ventilated filter cigarette with a coaxial filterelement |
US6089238A (en) * | 1997-05-30 | 2000-07-18 | Brown & Williamson Tobacco Corporation | Ultralight coaxial cigarette including a multipart filter |
EP0880904A1 (en) | 1997-05-30 | 1998-12-02 | British-American Tobacco (Germany) GmbH | Ultra-light coaxial cigarette with a multi-section filter |
WO2001064061A1 (en) * | 2000-03-01 | 2001-09-07 | Reemtsma Cigarettenfabriken Gmbh | Item for smoking |
CZ299205B6 (en) * | 2000-03-01 | 2008-05-14 | Reemtsma Cigarettenfabriken Gmbh | SmokerÆs article |
US8550092B2 (en) | 2007-07-17 | 2013-10-08 | British American Tobacco (Investments) Limited | Filter |
US9078471B2 (en) | 2007-07-17 | 2015-07-14 | British American Tobacco (Investments) Limited | Filter |
US10334875B2 (en) | 2007-07-17 | 2019-07-02 | British American Tobacco (Investments) Limited | Filter |
WO2009156269A1 (en) * | 2008-06-24 | 2009-12-30 | British American Tobacco (Investments) Limited | Filter for a smoking article |
CN102076231A (en) * | 2008-06-24 | 2011-05-25 | 英美烟草(投资)有限公司 | Filter for a smoking article |
CN104188106A (en) * | 2014-08-28 | 2014-12-10 | 云南中烟工业有限责任公司 | Cigarette filter tip with high interception efficiency and application |
EP3643185A4 (en) * | 2017-06-19 | 2021-05-26 | Japan Tobacco, Inc. | Smoking article filter and production method therefor |
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