US3882877A - Filter for tobacco smoke - Google Patents

Filter for tobacco smoke Download PDF

Info

Publication number
US3882877A
US3882877A US35286873A US3882877A US 3882877 A US3882877 A US 3882877A US 35286873 A US35286873 A US 35286873A US 3882877 A US3882877 A US 3882877A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
filter
fibers
smoke
invention
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
Inventor
Warren A Brackmann
Daniel Diianni
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.)
Rothmans of Pall Mall Canada Ltd
Original Assignee
Rothmans of Pall Mall Canada Ltd
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
Grant date

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SMOKERS' REQUISITES
    • A24DCIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00Tobacco smoke filters, e.g. filter-tips, filtering inserts; Mouthpieces for cigars or cigarettes
    • A24D3/06Use of materials for tobacco smoke filters
    • A24D3/08Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SMOKERS' REQUISITES
    • A24DCIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00Tobacco smoke filters, e.g. filter-tips, filtering inserts; Mouthpieces for cigars or cigarettes
    • A24D3/04Tobacco smoke filters characterised by their shape or structure

Abstract

A tobacco smoke filter, particularly for use in cigarettes, consists wholly of or includes elements consisting wholly of noncrimped fibers of thermoplastic polymeric non-adsorbent materials having a diameter less than 5 microns. A filter of this type reduces tar and nicotine levels in the smoke to low values while at the same time the filter has satisfactory draw properties and the smoke has enhanced ''''taste.

Description

United tates Patent 1191 Brackmann et a1.

1 1 FILTER FOR TOBACCO SMOKE [75] lnventors: Warren A. Brackmann, Cooksville,

Ontario; Daniel Dilanni, Toronto, Ontario, both of Canada [73] Assignee: Rothmans of Pall Mall Canada Limited, Toronto, Ontario, Canada [22] Filed: Apr. 20, 1973 [21] Appl. No.: 352,868

[30] Foreign Application Priority Data Apr. 26, 1972 United Kingdom 19495/72 52 us. (:1. 131/266; 131/269; 131/10./ 51 1111. c1 A24b 15/02 58 Field of Search l31/26l269, 131/10, 10.5, 10.7, 10.9

[56] References Cited UNITED STATES PATENTS 2,761,798 9/1956 Knudson 131/266 X 2,765,515 10/1956 Knudsen 131/266 X 2,774,680 12/1956 Hackney et a1. 131/266 UX 1 51 May 13, 1975 2,867,219 1/1959 Hug 131/10.7 X 2,916,038 12/1959 Wade 131/10.9 3,068,873 12/1962 A1lman,.1r. et 81.... 131/10.7 3,081,519 3/1963 Blades 61; a1. 131/269 X 3,225,390 12/1965 Kistler 131/261 R 3,251,365 5/1966 Keith et a1. 131/10.9 X 3,290,207 12/1966 Magat 8t 31.... 131/269 UX 3,393,120 7/1968 Touey et al... 131/269 UX 3,412,737 11/1968 Pinter et a1. 131/267 3,470,883 10/1969 Shepherd et 81 131/269 X 3,595,245 7/1971 Buntin et a1. 131/269 Primary Examiner-Melvin D. Rein Attorney, Agent, or Firm-Sim & McBurney [57] ABSTRACT A tobacco smoke filter, particularly for use in cigarettes, consists wholly of or includes elements consisting wholly of non-crimped fibers of thermoplastic polymeric non-adsorbent materials having a diameter less than 5 microns. A filter of this type reduces tar and nicotine levels in the smoke to low values while at the same time the filter has satisfactory draw properties and the smoke has enhanced taste.

5 Claims, 1 Drawing Figure FILTER FOR TOBACCO SMOKE FIELD OF THE INVENTION This invention relates to filters for tobacco smoke, more particularly to cigarette filters.

BACKGROUND TO THE INVENTION Tobacco smoke essentially consists of a dispersion of solid and liquid particles in air, and this dispersion will be referred to as an aerosol in this specification. The aerosol is extremely stable due to the small size of the particles concerned and hence gravity has a negligible effect compared with the effect of convection currents and Brownian movement. Tobacco smoke is thought to contain constituents injurious to health and many suggestions have been made of filters to at least partially remove constituents of the smoke prior to entry into the smokers mouth.

Tar and nicotine values of tobacco smoke entering the smokers mouth, ie. after filtration, are considered by Government bodies to be a significant indication of the effectiveness of a filter to remove injurious components of tobacco smoke. While it is possible to achieve very low levels of tar and nicotine values in tobacco smoke, frequently this is at the expense of taste and smoker satisfaction. For example, the filter may not allow adequate quantities of smoke to pass through the filter and hence the draw of the cigarette may not be satisfactory to the consumer.

SUMMARY OF THE-INVENTION In accordance with the present invention there is provided a filter for tobacco smoke which reduces tar and nicotine levels in the smoke to low values while at the same time providing a filter having satisfactory draw properties and enhanced taste properties. Further, the invention is concerned with methods of making the filter material.

Accordingly, the present invention is concerned with filters consisting wholly of or including elements consisting wholly of non-crimped fibers of thermoplastic natural or synthetic polymeric, non-absorbent material, the fibers having a diameter less than 5 microns.

BRIEF DESCRIPTION OF DRAWING The accompanying drawing is a part-sectional view of a cigarette filter in accordance with one embodiment of the invention.

DESCRIPTION OF PREFERRED EMBODIMENTS Tobacco smoke filters of polyolefin have been suggested heretofore in U.S. Pat. No. 2,966,157. However, the fibers forming this prior art filter medium have diameters considerably in excess of 5 microns and are crimped. If fibers having diameters greater than 5 microns are used, it is found that the superior tar and nicotine removal values observed for the filters of the present invention are not achieved for reasons outlined below.

Crimping of the filamentary material for tobacco smoke filters usually is considered necessary in order to displace portions of the individual filaments at angles to the axis of the filter tow so that, in the filter, these displaced portions of the filaments will be disposed across the flow path of the tobacco smoke for intercepting the particles to be filtered from the smoke. The crimping and crimp-deregistering operations are particularly critical to the production of high quality filters from cellulose acetate filaments and have been thought to be necessary for polyolefins fibers, as described in U.S. Pat. No. 2,966,157 referred to above. However, such operations add materially to the cost of production, and unless they are carried outwith care, products lacking in uniformity are apt to result. It has been found that the filters of the present invention wherein microfine fibers are used do not require the crimping of the individual fibers to provide effectiveness.

As indicated above, the filter elements provided in accordance with the present invention consist of a mass of noncrimped fibers of a thermoplastic material in which the individual fibers have a particle size less than 5 microns. The thermoplastic material fibers used preferably have substantially all of the fibers below 2 microns diameter, more preferably the fibers have an average diameter of about 1 micron. This element is positioned in the path of the cigarette smoke and is found to provide superior tar and nicotine reducing properties.

The mass of fibers in the filter element may be in the form of a scrambled mass of long fibers which may be self-sustaining or a mat of short fibers, generally supported on a tobacco smoke-permeable backing.

The filter elements of the present invention when utilized with cigarettes may be the sole filter element of the cigarette, although this may provide some crush problems if a paper sleeve is employed since the filter elements lack physical strength. The required structural strength, however, could be provided by the use of a plastic or cardboard sleeve.

In a preferred construction in accordance with this invention, the filter element of this invention forms one element of a multi-element filter. In accordance with this preferred aspect of the present invention there is provided a cigarette filter element comprising an outer sleeve, at least a pair of plugs of cellulose acetate filter material, or other commonly employed filter material, disposed within the sleeve in longitudinally spaced apart relation and a filter element consisting of a mass of thermoplastic fibers, each of the fibers having a diameter less than 5 microns and positioned between the plugs.

In this way there is provided a filter element which has substantially the strength of the conventional cellulose acetate fiber filter and the enhanced tar and nicotine reducing properties of the microfine polymeric fibers.

A cigarette filter in accordance with this embodiment of the invention as shown in the accompanying drawing, wherein a cylindrical filter 10, suitable for a cigarette, consists of three elements. An outer sleeve 12 of cork paper, plastic or any other convenient material, surrounds the elements. Two elements 14 and 16 constitute the majority of the length of the filter and are constructed of conventional filter material, such as cellulose acetate fibers. The elements 14 and 16 are longitudinally displaced from each other a short distance and in the gap 18 is positioned a third filter element 20. More than two such elements 14 and 16 may be provided, if desired. The third filter element 20 consists of a disc of a mass of polymeric fibers, each of which has a fiber size less than 5 microns. Preferably, in the disc 20 the majority of the fibers are positioned in the disc so that they are transverse to the flow of tobacco smoke. The gap 18 usually is substantially filled by the third filter element 20.

It will be seen that the filter disc 20 engages the inside wall of the sleeve 12 and hence is positioned in such a manner that tobacco smoke passing through the filter all passes through the disc. The element may have other forms, for example, a ball or similar mass of fibers positioned in the gap 18 and engaging the inner wall of the sleeve 12. In order to have efficient reduction of tar and nicotine levels from the smoke, it is necessary for the element 20 in whatever form it may take to be positioned in the path of the tobacco smoke so that substantially all of the smoke passes through the filter.

The precise mechanism whereby efficient filtration is achieved using the filters of the present invention is not fully understood, but the following theory is proposed. The diameter of the particles of the smoke aerosol is about 0.1 to 0.6 microns. Due to the small diameter of the fibers used in the filters of the present invention, the particles collide with the fibers and are removed from the aerosol. This action is in contrast to the situation when the conventional thicker fibers are employed, typically in conventional cellulose acetate filters and in the polyolefin fiber filters proposed in U.S. Pat. No. 2,966,157 discussed above, in which the particles are displaced by air flow slip lines round the fiber and hence are not impinged on the fibers. Therefore, when fibers of conventional filter fiber size are employed (typically about 10 to microns average diameter), the quantity of particles removed from the aerosol is considerably less than when the filter of the present invention is employed.

Conventional filter materials, such as cellulose acetate, absorb materials from the aerosol, including tar and nicotine, and as noted above have fibre sizes in excess of 10 microns. Therefore, when a cellulose acetate cigarette filter is examined after use it is found to be substantially dry, although stained. In contrast, the filters provided in accordance with the present invention are constructed of non-absorbent, thermoplastic fibres having fibre sizes less than 5 microns and it is found that the filter material of the invention after use is wet with impinged material removed from the aerosol.

It is observed that the taste of tobacco smoke filtered using the filter of the present invention is superior to that of conventionally-filtered tobacco smoke. It is theorized that this observed effect is due to the essentially different manner of remove] of material from the aerosol by the present invention as compared with conventional filters. In the absorption of material using cellulose acetate fibers, taste-producing volatile materials may be absorbed in addition to the tar and nicotine, whereas in the impingement of materials on fine diameter non-absorbent fibers when the filters of the present invention are used, it is possible for the flavorful volatiles to pass to the smokers mouth.

The polymeric materials used in the filters of the present invention may be any natural or synthetic thermoplastic material capable of formation into the fiber diameters required in the present invention. In addition, the material must be capable of withstanding the temperature of the tobacco smoke without substantial degradation and must be substantially inert to chemical attack by the tobacco smoke. Typical examples of materials which may be utilized to provide the fibers are polyolefins, polyesters and polyamides. Polyolefins which may be employed include polyethylene and polypropylene, or polymers of substituted olefins, such as, polytrifluorochloroethylene. Many polyesters may be used, such as polyethylene terephthalate. Among the polyamides which may be utilized are nylon 6, nylon 66 and nylon 610. Other thermoplastic polymeric materials also may be employed in the filters of the invention, such as polystyrene, and poly(methylmethacrylate. Fibers formed from copolymers also may be used.

While generally the filter element consists of a mass of a single polymeric material, it is possible to utilize a mass of fibers which is a mixture of fibers of two or more polymeric materials.

In the mass of fibers, the orientation of the fibers relative to the stream of tobacco smoke may be varied. Althoug it is possible to employ a mass of fibers in which the fibers are randomly oriented, it is preferred to employ a mass of fibers in which the individual fibers substantially are oriented transverse to the flow of smoke. it has been found that statistically orienting the fibers in this manner results in higher tar and nicotine removal than when a randomly-oriented mass of fibers is employed.

The filters of the present invention may be formed in any convenient manner. For example, fibers may be melt spun from a die having a plurality of openings therein, so that a mass of fibers is extruded. The mass may be collected and used as such, or may be subjected to physical treatment before use. Polymeric materials having low melting points and low melt viscosities are preferred since the heat required in the spinning operation thereby may be minimized.

EXAMPLE The invention is illustrated further by the following Example.

EXAMPLE Cigarettes were tested in a smoking apparatus capable of collecting and measuring total particulate solids which includes tar and nicotine, in smoke. Cigarettes tested, at the same pressure drop along the length thereof, were a cigarette with no filter, a cigarette with a conventional cellulose acetate filter and a cigarette with a filter including a disc of Acrylite fibers having an average diameter about 1 micron. The results are reproduced below:

Total Particulate solids cigarette with Acrylite fiber filter 8.4 mg cigarette with cellulose acetate filter 16.5 mg cigarette with no filter 30.5 mg

1. A self-sustaining filter for tobacco smoke comprising a plurality of filter elements. and including a sub stantially airtight tubular holder, a pair of cylindrical cellulose acetate filter elements positioned within and in contact with the inner wall of the holder. said pair of filter elements being spaced apart from each other to define a gap therebetween, said pair of filter elements and having an average fiber diameter of about 1 micron, the majority of the said fibers being oriented transverse to the flow of the tobacco smoke, said third filter element being positioned in the gap between said pair of filter elements, said third filter element having a diameter substantially that of said tubular holder and being in engagement with said inner wall.

2. The filter of claim 1 wherein said thermoplastic polymeric material is a nylon.

3. The filter of claim 1 wherein said thermoplastic polymeric material is poly (methylmethacrylate).

4. The filter of claim 1 wherein said third filter element is in the form of a disc.

5. The filter of claim 4 wherein the faces of said disc engage the opposed ends of the pair of elements.

Claims (5)

1. A SELF-SUSTAINING FILTER FOR TOBACCO SMOKE COMPRISING A PLURALITY OF FILTER ELEMENTS, AND INCLUDING A SUBSTANTIALLY AIRTIGHT TUBULAR HOLDER, A PAIR OF CYLINDRICAL CELLULOSE ACETATE FILTER ELEMENTS POSITIONED WITHIN AND IN CONTACT WITH THE INNER WALL OF THEE HOLDER, SAID PAIR OF FILTER ELEMENTS BEING SPACED APART FROM EACH OTHER TO DEFINE A GAP THEREBETWEEN, SAID PAIR OF FILTER ELEMENTS AND SAID TUBULAR HOLDER COMBINING TO PROVIDE SUFFICIENT CRUSH-RESISTANCE TO PROVIDE A SELF-SUSTAINING FILTER, AND A THIRD FILTER ELEMENT CONSISTING WHOLLY OF A PLURALIY OF RANDOMLY-ORIENTED, NON-CRIMPED, SMOOTH-SURFACED, SOLID FIBERS OF A THEMOPLASTIC POLYMERIC NON-ABSORBENT MATERIAL SELECTED FROM POLYOLEFINS, POLYESTERS, POLYAMIDES AND POLYSTYRENE, EACH OF SAID FIBERS HAVING A UNIFORM DIAMMETER LESS THAN ABOUT 5 MICRONS, WITH SUBSTANTIALLY ALL OF THE FIBERS BEING BELOW 2 MICRONS IN DIAMETER AND HAING AN AVERAGE FIBER DIAMETER OF ABOUT 1 MICRON, THE MAJORITY OF THE SAID FIBERS BEING ORIENTED TRANSVERSE TO THE FLOW OF THE TOBACCO SMOKE, SAID THIRD FILTER ELEMENT BEING POSITIONED IN THE GAP BETWEEN SAID PAIR OF FILTER ELEMENTS, SAID THIRD FILER ELEMENT HAVING A DIAMETER SUBSTANTIALLY THAT OF SAID TUBULAR HOLDER AND BEING IN ENGAGEMENT WITH SAID INNER WALL.
2. The filter of claim 1 wherein said thermoplastic polymeric material is a nYlon.
3. The filter of claim 1 wherein said thermoplastic polymeric material is poly (methylmethacrylate).
4. The filter of claim 1 wherein said third filter element is in the form of a disc.
5. The filter of claim 4 wherein the faces of said disc engage the opposed ends of the pair of elements.
US3882877A 1972-04-26 1973-04-20 Filter for tobacco smoke Expired - Lifetime US3882877A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1949572A GB1381800A (en) 1972-04-26 1972-04-26 Filter for tobacco smoke

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05544292 US4059121A (en) 1973-04-20 1975-01-27 Filter for tobacco smoke

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05544292 Continuation-In-Part US4059121A (en) 1972-04-26 1975-01-27 Filter for tobacco smoke

Publications (1)

Publication Number Publication Date
US3882877A true US3882877A (en) 1975-05-13

Family

ID=10130320

Family Applications (1)

Application Number Title Priority Date Filing Date
US3882877A Expired - Lifetime US3882877A (en) 1972-04-26 1973-04-20 Filter for tobacco smoke

Country Status (7)

Country Link
US (1) US3882877A (en)
JP (2) JPS4941599A (en)
CA (1) CA982008A (en)
DE (1) DE2321247B2 (en)
FR (1) FR2182548A5 (en)
GB (1) GB1381800A (en)
NL (1) NL7305408A (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564030A (en) * 1982-07-16 1986-01-14 Loew's Theatres, Inc. Cigarette filter assembly
US4903714A (en) * 1987-08-25 1990-02-27 R. J. Reynolds Tobacco Company Smoking article with improved mouthend piece
US4961415A (en) * 1987-01-16 1990-10-09 Kimberly-Clark Corporation Controlled draft and efficiency filter element for smoking articles
US5112345A (en) * 1990-12-17 1992-05-12 Interventional Technologies Atherectomy cutter with arcuate blades
US5190061A (en) * 1990-04-20 1993-03-02 Rothmans, Benson & Hedges Inc. Cigarette smoke filter
WO1994023600A1 (en) * 1993-04-14 1994-10-27 1149235 Ontario Inc. Smoker's accessory
US5509429A (en) * 1989-03-02 1996-04-23 Kothmans, Benson & Hedges Inc. Uniform tar delivery profile filter
US5524647A (en) * 1991-08-08 1996-06-11 Rothmans, Benson & Hedges, Inc. Control of cigarette smoke chemistry
US5538019A (en) * 1993-11-03 1996-07-23 Schweitzer-Mauduit International, Inc. Spunbond cigarette filter
US5845648A (en) * 1997-06-03 1998-12-08 Martin; John E. Multi-compartment expandable filter for a smoking product
WO1999043223A1 (en) 1998-02-26 1999-09-02 FÁBIÁN, János Filter insert for filter cigarettes
US20050161055A1 (en) * 2002-04-17 2005-07-28 Peter Rozim Filter unit for filter-cigarettes and filter cigarettes
WO2005102080A1 (en) * 2004-04-22 2005-11-03 G.D Societa' Per Azioni Cigarette filter and relative production method
US20080127988A1 (en) * 2006-08-08 2008-06-05 Philip Morris Usa Inc. Rapidly degradable filters via electron ionization
US20100006112A1 (en) * 2007-12-20 2010-01-14 Philip Morris Usa, Inc. Filter including randomly-oriented fibers for reduction of particle breakthrough
US7735494B2 (en) 2006-03-03 2010-06-15 Xerosmoke, Llc Tabacco smoking apparatus
US20110083686A1 (en) * 2009-10-09 2011-04-14 Philip Morris Usa Inc. Method and apparatus for manufacture of smoking article filter assembly including electrostatically charged fibers
WO2015110803A1 (en) * 2014-01-21 2015-07-30 British American Tobacco (Investments) Limited Filter materials and filters made therefrom

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3624661C2 (en) * 1986-07-22 1992-02-20 Rhone-Poulenc Rhodia Ag, 7800 Freiburg, De
JP2013243973A (en) * 2012-05-28 2013-12-09 Sumitomo Seika Chem Co Ltd Filter for cigarette

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761798A (en) * 1956-04-24 1956-09-04 H & V Specialties Co Inc Filter for tobacco smoke
US2765515A (en) * 1953-10-07 1956-10-09 H & V Specialties Co Inc Method of making a filter for tobacco smoke
US2774680A (en) * 1953-10-07 1956-12-18 Edward J Hackney Process for making aerosol filters
US2867219A (en) * 1956-08-02 1959-01-06 Thomas F Hug Cigarette filter
US2916038A (en) * 1954-02-23 1959-12-08 American Viscose Corp Tobacco smoke filter
US3068873A (en) * 1958-11-24 1962-12-18 Celanese Corp Filters
US3081519A (en) * 1962-01-31 1963-03-19 Fibrillated strand
US3225390A (en) * 1959-10-02 1965-12-28 Mueller Paul A Method of producing filter plugs
US3251365A (en) * 1963-03-04 1966-05-17 Ii Charles H Keith Tobacco smoke filter
US3290207A (en) * 1962-08-22 1966-12-06 Du Pont Fibrillated fiber
US3393120A (en) * 1965-09-22 1968-07-16 Eastman Kodak Co Polyolefin tow for cigarette filters
US3412737A (en) * 1966-01-17 1968-11-26 Karoly G. Pinter Smoke filter
US3470883A (en) * 1968-08-29 1969-10-07 Nat Patent Dev Corp Tobacco smoke filters
US3595245A (en) * 1968-08-14 1971-07-27 Exxon Research Engineering Co Cigarette filter from polypropylene fibers

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2765515A (en) * 1953-10-07 1956-10-09 H & V Specialties Co Inc Method of making a filter for tobacco smoke
US2774680A (en) * 1953-10-07 1956-12-18 Edward J Hackney Process for making aerosol filters
US2916038A (en) * 1954-02-23 1959-12-08 American Viscose Corp Tobacco smoke filter
US2761798A (en) * 1956-04-24 1956-09-04 H & V Specialties Co Inc Filter for tobacco smoke
US2867219A (en) * 1956-08-02 1959-01-06 Thomas F Hug Cigarette filter
US3068873A (en) * 1958-11-24 1962-12-18 Celanese Corp Filters
US3225390A (en) * 1959-10-02 1965-12-28 Mueller Paul A Method of producing filter plugs
US3081519A (en) * 1962-01-31 1963-03-19 Fibrillated strand
US3290207A (en) * 1962-08-22 1966-12-06 Du Pont Fibrillated fiber
US3251365A (en) * 1963-03-04 1966-05-17 Ii Charles H Keith Tobacco smoke filter
US3393120A (en) * 1965-09-22 1968-07-16 Eastman Kodak Co Polyolefin tow for cigarette filters
US3412737A (en) * 1966-01-17 1968-11-26 Karoly G. Pinter Smoke filter
US3595245A (en) * 1968-08-14 1971-07-27 Exxon Research Engineering Co Cigarette filter from polypropylene fibers
US3470883A (en) * 1968-08-29 1969-10-07 Nat Patent Dev Corp Tobacco smoke filters

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564030A (en) * 1982-07-16 1986-01-14 Loew's Theatres, Inc. Cigarette filter assembly
US4961415A (en) * 1987-01-16 1990-10-09 Kimberly-Clark Corporation Controlled draft and efficiency filter element for smoking articles
US4903714A (en) * 1987-08-25 1990-02-27 R. J. Reynolds Tobacco Company Smoking article with improved mouthend piece
US5509429A (en) * 1989-03-02 1996-04-23 Kothmans, Benson & Hedges Inc. Uniform tar delivery profile filter
US5190061A (en) * 1990-04-20 1993-03-02 Rothmans, Benson & Hedges Inc. Cigarette smoke filter
US5112345A (en) * 1990-12-17 1992-05-12 Interventional Technologies Atherectomy cutter with arcuate blades
US5524647A (en) * 1991-08-08 1996-06-11 Rothmans, Benson & Hedges, Inc. Control of cigarette smoke chemistry
US5495859A (en) * 1993-04-14 1996-03-05 1149235 Ontario Inc. Cigarette smoke filter system
US5497791A (en) * 1993-04-14 1996-03-12 114935 Ontario Inc. Smoker's accessory
WO1994023599A1 (en) * 1993-04-14 1994-10-27 1149235 Ontario Inc. Cigarette smoke filter system
WO1994023600A1 (en) * 1993-04-14 1994-10-27 1149235 Ontario Inc. Smoker's accessory
US5752527A (en) * 1993-04-14 1998-05-19 Ontario Inc. Smoker's accessory
US5638833A (en) * 1993-04-14 1997-06-17 1149235 Ontario Inc. Cigarette smoke filter system
US5538019A (en) * 1993-11-03 1996-07-23 Schweitzer-Mauduit International, Inc. Spunbond cigarette filter
US5845648A (en) * 1997-06-03 1998-12-08 Martin; John E. Multi-compartment expandable filter for a smoking product
WO1999043223A1 (en) 1998-02-26 1999-09-02 FÁBIÁN, János Filter insert for filter cigarettes
US20050161055A1 (en) * 2002-04-17 2005-07-28 Peter Rozim Filter unit for filter-cigarettes and filter cigarettes
WO2005102080A1 (en) * 2004-04-22 2005-11-03 G.D Societa' Per Azioni Cigarette filter and relative production method
US20080029115A1 (en) * 2004-04-22 2008-02-07 G.D Societa' Per Azioni Method of Production of a Cigarette Filter
US7625328B2 (en) 2004-04-22 2009-12-01 G.D. Societa' Per Azioni Method of production of a cigarette filter
US7735494B2 (en) 2006-03-03 2010-06-15 Xerosmoke, Llc Tabacco smoking apparatus
US20110036361A1 (en) * 2006-03-03 2011-02-17 Xerosmoke Llc Tobacco smoking apparatus
US20080127988A1 (en) * 2006-08-08 2008-06-05 Philip Morris Usa Inc. Rapidly degradable filters via electron ionization
US7896011B2 (en) * 2006-08-08 2011-03-01 Philip Morris Usa, Inc. Method of forming a filter component
US20110132381A1 (en) * 2006-08-08 2011-06-09 Philip Morris Usa Inc. Rapidly degradable filters via electron ionization
US20100006112A1 (en) * 2007-12-20 2010-01-14 Philip Morris Usa, Inc. Filter including randomly-oriented fibers for reduction of particle breakthrough
US20110083686A1 (en) * 2009-10-09 2011-04-14 Philip Morris Usa Inc. Method and apparatus for manufacture of smoking article filter assembly including electrostatically charged fibers
US8534294B2 (en) 2009-10-09 2013-09-17 Philip Morris Usa Inc. Method for manufacture of smoking article filter assembly including electrostatically charged fiber
US9788572B2 (en) 2009-10-09 2017-10-17 Philip Morris Usa Inc. Method and apparatus for manufacture of smoking article filter assembly including electrostatically charged fibers
WO2015110803A1 (en) * 2014-01-21 2015-07-30 British American Tobacco (Investments) Limited Filter materials and filters made therefrom

Also Published As

Publication number Publication date Type
JPS4941599A (en) 1974-04-18 application
DE2321247B2 (en) 1976-04-01 application
DE2321247A1 (en) 1973-11-08 application
JPS5618313Y2 (en) 1981-04-28 grant
JPS5350300U (en) 1978-04-27 application
CA982008A (en) 1976-01-20 grant
FR2182548A5 (en) 1973-12-07 application
GB1381800A (en) 1975-01-29 application
CA982008A1 (en) grant
NL7305408A (en) 1973-10-30 application

Similar Documents

Publication Publication Date Title
US3581748A (en) Cigarette filter
US3251365A (en) Tobacco smoke filter
US3547130A (en) Method of cooling cigarette smoke
US3334636A (en) Filter for smokers' article
US3311519A (en) Additive filter
US3395713A (en) Filtering arrangement for smoking articles
US3236244A (en) Tobacco smoke filter element
US3313306A (en) Stable elongated elements and smoking means incorporating the same
US3396061A (en) Smoke filters
US3409020A (en) Tobacco smoke filter
US3349780A (en) Acetate filter elements containing carbon
US3046994A (en) Ventilated cigarette
USRE31285E (en) Method for manufacturing a filter of electrically charged electret fiber material and electret filters obtained according to said method
US5465739A (en) Cigarette and cigarette filter element therefor
US4274914A (en) Filter material
US3685521A (en) Cigarette holder containing actuated carbon and frangible capsule
US5074320A (en) Cigarette and cigarette filter
US5025814A (en) Cigarette filters containing strands of tobacco-containing materials
US5724997A (en) Disposable flavored filter for cigarettes
US4649945A (en) Adjustable air dilution cigarette exhibiting controlled pressure drop
US4481958A (en) Combustible carbon filter and smoking product
US2794239A (en) Tow for use in the production of tobacco smoke filters
US5622190A (en) Concentric smoking filter having cellulose acetate tow periphery and carbon-particle-loaded web filter core
US2954772A (en) Removal of tar and other deleterious substances from tobacco smoke
EP0292949A2 (en) Filter for tobacco smoking