United States Patent [19J
`Counts et al.
`
`[54] ELECTRICAL SMOKING SYSTEM
`
`[75)
`
`Inventors: Mary Ellen Counts. Richmond; Grier
`S. Fleiscbhauer, Midlothian;
`Mohammad R. llajalogol. Richmond;
`Patrick B. Bayes. Chester; Charles T.
`Biggins; Wdlie G. Houck, Jr .. both of
`Richmond; Bernard C. Laroy.
`Richmond; Peter J. Upowicz.
`Midlothian; Constance B. Nldlols.
`Chesterfield; Mantharam Subbiah,
`Midlothian; Michael L Watkins,
`Chester, all of Va.
`
`[73) Assignee: Phillp Morris Incorporated. New
`York,N.Y.
`
`[ *) Notice:
`
`The portion of the term of this patent
`subsequent to Mar. 11. 2011. has been
`disclaimed.
`
`[21] Appl No.: 452,635
`May 25, 1995
`
`[22] Filed:
`
`Related U.S. Application Data
`
`[62] Division of Ser. No. 380,718, Jan. 30, 1995, which is a
`continuation of Ser. No. 118,665, Sep. 10, 1993, Pat No.
`5,388,594, which is a continuation-in-pan of Ser. No. 943,
`504, Sep. 11, 1992, Pat No. 5,505,214, which is a continu(cid:173)
`ation.,in-part of Ser. No. 666,926, Mar. 11, 1991, abandoned.
`Int. CL6
`................................. B85B 3/58; A24F 1/22
`[51]
`[52] U.S. CJ .............................................. 21'1/535; 131/194
`[58) Field of Search ..................................... 219/535. 536,
`219/537, 538, 539, 553; 392/386. 390;
`131/194
`
`[56]
`
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`
`US005708258A
`[111 Patent Number:
`[45J Date of Patent:
`
`5,708,258
`* Jan. 13, 1998
`
`3,200,819 3/1965 Gilbert .
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`
`OfHER PUBLICATIONS
`
`Excerpt from "NASA Tech Briefs,tt JulJAug. 1988, p. 31.
`"PCT Thermistors." Keystone Carbon Company product
`literature.
`
`Primary Emminer-Mark H. Paschall
`Assistant Examiner-Sam Paik
`Attome-J> Agent. or Firm-Charles E. B. Glenn; James E.
`Schardt; James T. Moore
`
`[57]
`
`ABSTRACT
`
`A smoking system is provided in which a replaceable
`cigarette containing tobacco flavor material is electrically
`heated by a set of electrical heater elements contained within
`a lighter to evolve tobacco flavors or other components in
`vapor or aerosol form for delivery to a smoker. The cigarette
`and lighter are adapted to provide air flow patta:ns through
`the smoking system such that air flows transversely into the
`cigarette. Such patta:ns improve aerosol and flavor delivery
`to the smoker and reduce the condensation of residual
`heater-region vapor/aerosol in the smoking system.
`
`14 Claims, 15 Drawing Sheets
`
`83"
`
`179
`177
`
`93
`
`Ex. 2013-0001
`
`

`

`U.S. PATENT DOCUMENTS
`
`9/1971 Briskin et al ..
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`6/1973 Bennett.
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`1/1978 Guerra.
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`8/1979 Pearlman.
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`3/1981 Carter et al. .
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`711984 Lawrence et al. .
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`4,621,649 11/1986 Osterrath.
`4,623,401 11/1986 Deroyshire et a1 ..
`111987 Bonanno et al . .
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`4,659,912
`4/1987 Deroyshire .
`
`5,708,258
`Page 2
`
`4/1988 Gerth et al . .
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`9/1988 Myer.
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`4,776,353 10/1988 Lilja et al ..
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`7/1989 Lilja et al ..
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`4,874,924 10/1989 Yamamoto et al ..
`4,877,989 10/1989 Drews.
`5/1990 Brooks et al ..
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`8/1990 Gori.
`4,945,931
`8/1990 Brooks et al ..
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`8/1990 Brooks et al ..
`4,947,875
`4,966,171 10/1990 Serrano et al. .
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`1/1991 Nichols et al ..
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`5,060,671 10/1991 Counts et al. .
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`3/1992 Deevi et al ..
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`5,095,921
`5,144,962
`9/1992 Counts et al. .
`5,159,940 11/1992 Haywatd et al ..
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`8/1993 Blackbum.
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`5,249,586 10/1993 Morgan et al . .
`5,269,327 12/1993 Counts et al. .
`5.274,214 12/1993 Blackbum.
`5,285,050
`2/1994 Blackbum.
`
`Ex. 2013-0002
`
`

`

`U.S. Patent
`
`Jan. 13, 1998
`
`Sheet 1 of 15
`
`5,708,258
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`Jan. 13, 1998
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`5.708,258
`
`1
`ELECTRICAL SMOKING SYSTEM
`
`This application is a divisional of U.S. patent application
`Ser. No. 08/380,718. filed Jan. 30, 1995. and Ser. No.
`08/118,665. filed Sep. 10, 1993, the latter having issued as
`U.S. Pat No. 5388,594 on Feb. 14, 1995, and being a
`continuation-in-part of commonly-assigned U.S. patent
`application Ser. No. 07/943.504, filed Sep. 11, 1992, which
`issued as U.S. Pat. No. 5,505,214 on Apr. 9. 1996. and which
`in turn is a continuation-in-part of commonly-assigned U.S.
`patent application Ser. No. 071666,926, filed Mar. 11, 1991,
`now abandoned in favor of file wrapper continuation appli(cid:173)
`cation Ser. No. 081012,799, filed Feb. 2, 1993. which issued
`as U.S. Pat. No. 5.249,586 on Oct. 5. 1993.
`
`BACKGROUND OF THE INVENTION
`This invention relates to smoking systems in which ciga(cid:173)
`rettes are used with lighters, and methods for making the
`same.
`An electrical smoking article is described in commonly-
`assigned U.S. Pat. No. 5,060,671, which is hereby incorpo(cid:173)
`rated by reference in its entirety. That patent describes a
`smoking article which is provided with a disposable set of
`
`2
`conventional high-volume assembly machinery. More
`specifically, that application describes a disposable tobacco
`flavor unit having a ''tube-in-tube" construction, wherein
`tobacco flavor material positioned on a carrier and formed
`5 into a cylinder around free-flow, back-flow, and mouthpiece
`filters is disposed within an aerosol barrier tube. Heater
`elements are placed between the aerosol barrier tube and the
`tobacco flavor unit to heat the tobacco flavor unit. The
`aerosol barrier tube prevents aerosols formed during heating
`10 of the tobacco flavor unit and the heaters from condensing
`on permanent portions of the electrical smoking article. That
`application also describes the use of phosphorous doped
`silicon heater elements having the ability to cycle to tem(cid:173)
`peratures of between 200° C. and 900° C. and deliver
`15 between 5 and 40 Joules of energy repeatedly without
`failure.
`In light of the above. it is therefore desirable to be able to
`provide an improved smoking system in which the heating
`elements of the lighter are reusable.
`It is also desirable to be able to provide such a system in
`which condensation of aerosol onto the heating elements and
`other structural components of the lighter is minimized.
`It is further desirable to provide a smoking article which
`is easier to manufacture.
`It is still further desirable to provide a smoking article
`which provides improved flavor delivery to the smoker.
`
`20
`
`:~~:1 c~::f!n;~e7:rnt!~!i,~~~~b~~~o1:cct:b!~:~~ 25
`
`derived material is deposited on each of the heating ele(cid:173)
`ments. The disposable heaterftlavor unit is mated to a source
`of electrical energy such as a battery or capacitor, as well as
`to control circuitry to actuate the heating elements in
`response to a puff by a smoker on the article or in response
`to the depression of a manual switch. The circuitry is
`designed so that at least one, but less than all of the heating
`elements are actuated for any one puff, and so that a
`predetermined number of puffs. each containing a pre-
`measured amount of tobacco flavor substance, e.g., an
`aerosol containing tobacco flavors or a flavored tobacco
`response, is delivered to the smoker. The circuitry also
`preferably prevents the actuation of any particular heater
`more than once, to prevent overheating of the tobacco flavor
`medium thereon.
`With such articles, the heater is thrown away with the
`spent remainder of tobacco material. Also, the electrical
`connections between the heaters and the battery must be able
`to endure repeated release and reconnection as flavor units 45
`are replaced.
`In copending, commonly-assigned U.S. patent application
`Ser. No. 07/666,926, filed Mar.11.1991, now abandoned in
`favor of Continuing Application Ser. No. 08/012,799. filed
`Feb. 2, 1993, an electrical smoking article is disclosed that 50
`has reusable heating elements and a disposable portion for
`tobacco flavor generation. The disposable portion preferably
`includes a flavor segment and a filter segment, attached by
`a tipping paper or other fastening arrangement Certain
`operational difficulties are, however, associated with reus- 55
`able heating elements, particularly in that residual aerosol
`tends to settle and condense on the heating elements and
`other permanent structural components of the article.
`U.S. patent application Ser. No. 071943,504, filed Sep. 11.
`1992, which is hereby incorporated by reference in its 60
`entirety, describes another electrical smoking article that has
`reusable heating elements and a disposable portion for
`tobacco flavor generation. That application addresses prob(cid:173)
`lems relating to the long-term use of heating elements and
`other permanent structural components of the article. That 6S
`application also descn'bes a manufacturing process for mak(cid:173)
`ing the disposable portion of the smoking article using
`
`30
`
`35
`
`40
`
`SUMMARY OF THE INVENTION
`Accordingly, a primary object of the present invention is
`to provide a novel smoking system which provides advan(cid:173)
`tages over prior systems.
`Another object of the present invention is to provide
`improved flavor delivery from a smoking system in which
`cigarettes are used with lighters.
`It is also an object of this invention to provide a smoking
`system in which the heating elements of a lighter are
`reusable, and of which the volume of disposable portions is
`minimized.
`It is also an object of this invention to provide a system
`in which condensation of aerosol onto heating elements and
`other structural components of a lighter is minimized.
`It is a further object of this invention to provide a smoking
`article and manufacturing processes for making the same
`that are easier and cost effective, even at state-of-the-art
`mass production speeds.
`It is a still further object of this invention to provide
`improved aerosol and flavor delivery to the smoker.
`In accordance with one aspect of the present invention, a
`cigarette for use in a smoking system for delivering a
`flavored tobaccQ response to a smoker, the system including
`heating means, is provided. The cigarette includes a carrier
`having first and second ends spaced apart in a longitudinal
`direction and having first and second surfaces. The first
`surface defines a cavity between the first and second ends,
`and the second surface includes an area for being disposed
`adjacent heating means. Tobacco flavor material is disposed
`on the first surface of the carrier. The tobacco flavor material
`generates the flavored tobacco response in the cavity for
`delivery to a smoker when the tobacco flavor material is
`heated by the heating means. The carrier and the tobacco
`flavor material allow transverse air flow into the cavity.
`In accordance with another aspect of the present
`invention, a lighter for use in combination with a removable
`cigarette in a smoking system that delivers a flavored
`tobacco response to a smoker is provided. The lighter
`
`Ex. 2013-0018
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`

`

`5,708,258
`
`3
`includes a heater fixture for receiving, through a first end. a
`removable cigarette. The heater fixture has means for pro(cid:173)
`viding a transverse flow of air to at least a portion of the
`cigarette. A plurality of electrical heater elements are dis(cid:173)
`posed in the heater fixture. Each of the heater elements has
`a surface for being disposed adjacent a surface of the portion
`of the cigarette to which the transverse flow of air is
`provided. Means are provided for activating one or more of
`the plurality of electrical heating means such that a prede(cid:173)
`termined quantity of flavored tobacco response is generated
`in the cigarette. The transverse flow of air is generated when
`a smoker draws on a cigarette inserted in the lighter.
`In accordance with another aspect of the present
`invention, a smoking system for delivering a flavored
`tobacco response to a smoker is provided. The system 15
`includes a removable cigarette, a lighter, and, means for
`individually activating the plurality of electrical heating
`means such that a predetermined quantity of flavored
`tobacco response is generated in a cavity in the cigarette.
`In accordance with yet another aspect of the present 20
`invention, a heater element for use in a smoking system for
`delivering a flavored tobacco response to a smoker is
`provided. The heater element includes a first end, a second
`end, and a plurality of curved regions between the first and
`second ends for increasing electrical resistance of the heater 25
`element. The heater element is formed from resistive mate(cid:173)
`rial having first and second surfaces substantially oriented in
`a plane and having an overall length L, overall width W, and
`thickness T. The effective electrical length of the heater
`element is greater than the length L and the effective
`electrical cross-sectional area of the heater element is less
`than the product of W and T.
`In accordance with still another aspect of the present
`invention, a method for manufacturing an integrated heater
`assembly for use in a smoking system for delivering a
`flavored tobacco response to a smoker is described. Accord(cid:173)
`ing to the method, a sheet of resistive material is cut to form
`a plurality of heater elements connected to one another at at
`least one end The sheet is formed into a cylindrical shape. 40
`BRJEF DESCRIPfION OF THE DRAWINGS
`The present invention can be further understood with
`reference to the following description in conjunction with
`the appended drawings, wherein the same elements are 45
`provided with the same reference numerals. In the drawings:
`FIG. 1 is a schematic perspective view of a smoking
`system according to an embodiment of the present inven(cid:173)
`tion;
`FIG. 2 is a partially broken, schematic perspective view of so
`a smoking system according to an embodiment of the
`present invention;
`HG. 3A is a side, cross-sectional view of a heater fixture
`according to an embodiment of the present invention;
`FIG. 3B is an end view of taken at section JB-3B of HG. 55
`3A;
`FIG. 4A is a schematic perspective view of a cigarette
`according to an embodiment of the present invention;
`FIG. 4B is a side cross-sectional view taken at section
`4B-4B of FIG. 4A;
`HG. 5 is a schematic assembly view of a heater fixture
`according to another embodiment of the present invention;
`HG. 6 is a perspective view of a heater assembly accord(cid:173)
`ing to an embodiment of the present invention;
`FIG. 7 is an outline of a heater assembly according to an
`embodiment of the present invention;
`
`4
`FIG. 8 is a perspective view of a portion of a heater
`element according to an embodiment of the present inven(cid:173)
`tion;
`FIG. 9 is a perspective view of a pin assembly according
`5 to an embodiment of the present invention;
`FIG. lOA is a schematic, side cross-sectional view of a
`spacer according to an embodiment of the present invention;
`FIG. lOB is a schematic view taken at section lOB-lOB
`10 of HG. 10A;
`HG. l0C is a schematic view taken at section lOC-lOC
`of HG. l0A;
`HG. llA is a schematic, side cross-sectional view of a
`base according to an embodiment of the present invention;
`FIG. llB is a schematic view taken at section llB-llB
`of FIG. llA;
`FIG. llC is a schematic view taken at section llC-llC
`of FIG. llA;
`HG. 12Ais a schematic, perspective view of a combined
`spacer base member according to an embodiment of the
`present invention;
`HG. 128 is a schematic, side cross-sectional view taken
`at section 12B-12B of FIG. 12A;
`HG. 12C is a schematic view taken at section 12C-12C
`of FIG. 12A;
`FIG. 12D is a schematic view taken at section 12D-12D
`of FIG. 12A;
`FIG. 13 is an end view of a ring according to an embodi-
`30 ment of the present invention;
`HG. 14A is a schematic, perspective view of a cap
`according to an embodiment of the present invention;
`HG. 14B is a schematic. side cross-sectional view taken
`35 at section 14B-14B of FIG. 12A;
`HG. 14C is a schematic view taken at section 14C-14C
`of FIG. 14A;
`HG. 14D is a schematic view taken at section 140-14D
`of FIG. 14A;
`FIG. ISA is a schematic side view of a heater sleeve
`according to an embodiment of the present invention;
`FIG. 1SB is an end view taken at section lSB-lSB of
`HG. ISA;
`FIGS. 16 and 17 are schematic side cross-sectional views
`of portions of a smoking system showing air flow paths in
`the smoking system; and
`HG. 18 is a schematic circuit diagram showing circuitry
`according to an embodiment of the invention.
`
`DETAILED DESCRJPI1ON
`A smoking system 21 according to the present invention
`is seen with reference to FIGS. 1 and 2. The smoking system
`21 includes a cigarette 23 and a reusable lighter 2S. The
`cigarette 23 is adapted to be inserted in and removed from
`an orifice 27 at a front end 29 of the lighter 25. The smoking
`system 21 is used in much the same fashion as a conven(cid:173)
`tional cigarette. The cigarette 23 is disposed of after one or
`more puff cycles. The lighter 25 is preferably disposed of
`60 after a greater number of puff cycles as the cigarette 23.
`The lighter 25 includes a housing 31 and has front and
`rear portions 33 and 35. A power source 37 for supplying
`energy to heating elements for heating the cigarette 23 is
`preferably disposed in the rear portion 35 of the lighter 2S.
`65 The rear portion 35 is preferably adapted to be easily opened
`and closed. such as with screws or with snap-fit components,
`to facilitate replacement of the power source 37. The front
`
`Ex. 2013-0019
`
`

`

`5,708,258
`
`10
`
`5
`portion 33 preferably houses heating elements and circuitry
`in electrical communication with the power source 37 in the
`rear portion 35. The front portion 33 is preferably easily
`joined to the rear portion 35. such as with a dovetail joint or
`by a socket fit. The housing 31 is preferably made from a 5
`hard, heat-resistant material. Preferred materials include
`metal-based or, more preferably. polymer-based materials.
`The housing 31 is preferably adapted to fit comfortably in
`the hand of a smoker and, in a presently preferred
`embodiment, has overall dimensions of 10.7 cm by 3.8 cm
`by 1.5 cm.
`The power source 37 is sized to provide sufficient power
`for heating elements that heat the cigarette 23. The power
`source 37 is preferably replaceable and rechargeable and
`may include devices such as a capacitor or, more preferably,
`a battery. In a presently preferred embodiment, the power 15
`source is a replaceable, rechargeable battery (actually fom
`nickel cadmium battery cells connected in series) with a
`total, non-loaded voltage of approximately 4.8 to 5.6 volts.
`The characteristics required of the power source 37 are,
`however, selected in view of the characteristics of other 20
`components in the smoking system 21, particularly the
`characteristics of the heating elements. U.S. Pat. No. 5,144,
`962 describes several forms of power sources useful in
`connection with the smoking system of the present
`invention, such as rechargeable battery power sources and 25
`quick-discharging capacitor power sources that are charged
`by batteries, and is hereby incorporated by reference.
`A substantially cylindrical heating fixture 39 for heating
`the cigarette 23. and, preferably, for holding the cigarette in
`place relative to the lighter 25, and electrical control cir- 30
`cuitry 41 for delivering a predetermined amount of energy
`from the power source 37 to heating elements (not seen in
`FIGS. 1 and 2) of the heating fixture are preferably disposed
`in the front 33 of the lighter. In the presently preferred
`embodiment, the heating fixture 39 includes eight radially 35
`spaced heating elements 43, seen in FIG. 3A, that are
`individually energized by the power source 37 under the
`control of the circuitry 41 to heat eight areas around the
`periphery of the cigarette 23 to develop eight puffs of a
`flavored tobacco response. While other numbers of heating 40
`elements 43 may be provided, eight heater elements are
`}Teferred, at least because there are nominally eight puffs on
`a conventional cigarette and because eight heater elements
`lend themselves to electrical control with binary devices.
`The circuitry 41 is preferably activated by a puff-actuated 45
`sensor 45, seen in FIG. 2, that is sensitive either to pressure
`changes or air flow changes that occur when a smoker draws
`on the cigarette 23. The puff-actuated sensor 45 is preferably
`disposed in the front 33 of the lighter 2S and communicates
`with a space inside the heater fixture 39 and near the 50
`cigarette 23 through a passageway 47 extending through a
`spacer 49 and a base SO of the heater fixture and, if desired,
`a puff sensor tube (not shown). A puff-actuated sensor 45
`suitable for use in the smoking system 21 is described in
`U.S. Pat. No. 5,060,671, the disclosure of which is incor- ss
`porated by reference, and is in the form of a Model
`163PC01D35 silicon sensor, manufactured by the
`MicroSwitch division of HoneFell, Inc., Freeport, ID., which
`activates an appropriate one of the heater elements 43 as a
`result of a change in pressure when a smoker draws on the 60
`cigarette 23. Flow sensing devices, such as those using
`hot-wire anemometry principles, have also been success(cid:173)
`fully demonstrated to be useful for activating an appropriate
`one of the heater elements 43 upon detection of a change in
`air flow.
`An indicator Sl is preferably provided on the exterior of
`the lighter 25, preferably on the front 33, to indicate the
`
`6
`number of puffs remaining on a cigarette 23 inserted in the
`lighter. The indicator Sl preferably includes a seven(cid:173)
`segment liquid crystal display. In the presently preferred
`embodiment, the indicator Sl displays the digit "8" when a
`light beam emitted by a light sensor 53. seen in AG. 2, is
`reflected off of the front of a newly inserted cigarette 23 and
`detected by the light sensor. The light sensor 53 is preferably
`mounted in an opening SS in the spacer 49 and the base SO
`of the heater fixture 39. seen, for example, in FIG. 3A. The
`light sensor 53 provides a signal to the circuitry 41 which,
`in turn, provides a signal to the indicator 51. The display of
`the digit "8" on the indicator 51 reflects that the preferred
`eight puffs provided on each cigarette 23 are available, i.e.,
`none of the heater elements 43 have been activated to heat
`the new cigarette. After the cigarette 23 is fully smoked, the
`indicator displays the digit "O". When the cigarette 23 is
`removed from the lighter 25, the light sensor 53 does not
`detect the presence of a cigarette 23 and the indicator Sl is
`turned off. The light sensor 53 is modulated so that it does
`not constantly emit a light beam and provide an unnecessary
`drain on the power source 37. A presently preferred light
`sensor S3 suitable for use with the smoking system 21 is a
`Type OPR5005 Light Sensor, manufactured by OPfEK
`Technology. Inc., 1215 West Crosby Road, Carrollton. Tex.
`75006.
`As one of several possible alternatives to using the
`above-noted light sensor 53, a mechanical switch (not
`shown) may be provided to detect the presence or absence
`of a cigarette 23 and a reset button (not shown) may be
`provided for resetting the circuitry 41 when a new cigarette
`is inserted in the lighter 25, e.g., to cause the indicator Sl to
`display the digit "8", etc. Power sources, circuitry, puff(cid:173)
`actuated sensors, and indicators useM with the smoking
`system 21 of the present invention are described in U.S. Pat.
`No. 5,060,671 and U.S. patent application Ser. No. 07/943.
`504, both of which are incorporated by reference. The
`passageway 47 and the opening SS in the spacer 49 and the
`heater fixture base 50 are preferably air-tight during smok(cid:173)
`ing.
`A presently preferred cigarette 23 for use with the smok(cid:173)
`ing system 21 is seen in detail in FIGS. 4A and 4B, although
`the cigarette may be in any desired form capable of gener(cid:173)
`ating a flavored tobacco response for delivery to a smoker
`when the cigarette is heated by the heating elements 43. The
`cigarette 23 includes a tobacco web 57 formed of a carrier
`or plenum 59 which supports tobacco flavor material 61,
`preferably including tobacco. The tobacco web 57 is
`wrapped around and supported by a cylindrical back-flow
`filter 63 at one end and a cylindrical first free-flow filter 6S
`at an opposite end The first free-flow filter 65 is preferably
`an "open-tube" type filter having a longitudinal passage 67
`extending through the center of the first free-flow filter and,
`hence, provides a low resistance to draw or free flow.
`If desired, cigarette overwrap paper 69 is wrapped around
`the tobacco web S7. Types of paper useful as the overwrap
`paper 69 include a low basis weight paper, preferably a
`paper with a tobacco flavor coating, or a tobacco-based
`paper to enhance the tobacco flavor of a flavored tobacco
`response. A concentrated extract liquor in full or diluted
`strength may be coated on the overwrap paper 69. The
`overwrap paper 69 preferably possesses a minimal base
`weight and caliper while providing sufficient tensile strength
`for machine processes. Presently preferred characteristics of
`a tobacco-based paper include a basis weight (at 60%
`65 relative humidity) of between 20-25 grams/m2
`, minimum
`permeability of 0-25 CORESTA (defined as the amount of
`air, measured in cubic centimeters, that passes through one
`
`Ex. 2013-0020
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`

`5,708,258
`
`7
`square centimeter of material, e.g., a paper sheet, in one
`minute at a pressure drop of 1.0 kilopascal), tensile strength
`i§;2000 grams/27 mm width (1 in/min), caliper 1.3-1.5 mils,
`CaCO3 content f5%, citrate 0%. Materials for forming the
`overwrap paper 6!) preferably include ~75% tobacco-based
`sheet (non-cigar. flue- or flue-lair-cured mix filler and bright
`stem). Flax fiber in amounts no greater than that necessary
`to obtain adequate tensile strength may be added. The
`overwrap paper 69 can also be conventional flax fiber paper
`of basis weight 15-20 g/m2 or such paper with an extract 10
`coating. Binder in the form of citrus pectin may be added in
`amounts less than or equal to 1 %. Glycerin in amounts no
`greater than necessary to obtain paper sti1fness similar to that
`of conventional cigarette paper may be added.
`The cigarette 23 also preferably includes a cylindrical
`mouthpiece filter 71. which is preferably a conventional
`RTD-type (Resistance To Draw) filter, and a cylindrical
`second free-flow filter 73. The mouthpiece filter 71 and the
`second free-flow filter are secured to one another by tipping
`paper 75. The tipping paper 75 extends past an end of the
`second free-flow filter 73 and is attached to the overwrap
`paper 69 to secure an end of the first free-flow filter 65 in
`position adjacent an end of the second free-flow filter. Like
`the first free-flow filter 65. the second free-flow filter 73 is
`preferably formed with a longitudinal passage 77 extending
`through its center. The back-flow fi