(19)
(11)EP 3 048 911 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
20.07.2022 Bulletin 2022/29

(21)Application number: 14781028.7

(22)Date of filing:  26.09.2014
(51)International Patent Classification (IPC): 
A24F 40/44(2020.01)
(52)Cooperative Patent Classification (CPC):
A24F 40/10; A24F 40/44; A24F 40/46
(86)International application number:
PCT/US2014/057613
(87)International publication number:
WO 2015/048388 (02.04.2015 Gazette  2015/13)

(54)

ELECTRONIC SMOKING ARTICLE

ELEKTRONISCHER RAUCHARTIKEL

ARTICLE À FUMER ÉLECTRONIQUE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 26.09.2013 US 201361883023 P

(43)Date of publication of application:
03.08.2016 Bulletin 2016/31

(73)Proprietor: Altria Client Services LLC
Richmond, Virginia 23230 (US)

(72)Inventors:
  • SCHIFF, David
    Highland Park, New Jersey 08904 (US)
  • CARRICK, Chris
    Newark, Delaware 19702 (US)
  • HAWES, Eric
    Midlothian, Virginia 23113 (US)
  • ROSTAMI, Ali
    Glen Allen, Virginia 23059 (US)
  • TUCKER, Christopher S.
    Midlothian, Virginia 23114 (US)
  • YERKIC-HUSEJNOVIC, Berina
    Richmond, Virginia 23294 (US)

(74)Representative: Docherty, Andrew John 
Marks & Clerk LLP The Beacon 176 St Vincent Street
Glasgow G2 5SG
Glasgow G2 5SG (GB)


(56)References cited: : 
EP-A1- 2 340 730
US-A1- 2013 192 621
US-A1- 2013 220 315
US-A- 4 947 875
US-A1- 2013 199 528
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Cross Reference to Related Application


    Working Environment



    [0001] Many of the embodiments disclosed herein include electronic smoking articles operable to deliver liquid from a liquid supply reservoir (source) to a heater. The heater volatilizes a liquid to form an aerosol. US 2013/199528 A1 discloses a medicant delivery system wherein the carrier from the medicant is a fluid that can be atomized or vaporized by exposure to heat.

    Summary of Selected Features



    [0002] In a first aspect there is an electronic smoking article according to the appended claims.

    [0003] An electronic smoking article comprises a liquid aerosol formulation, at least one filamentary wick operable to transfer the liquid aerosol formulation, at least one heater operable to at least partially volatilize the liquid aerosol formulation and form an aerosol, a power supply operable to apply voltage across the at least one heater, and a support plate operable to support the at least one heater and the filamentary wick and to form an electrical connection between the at least one heater and the power supply.

    [0004] In an embodiment, the support plate includes a conductive circuit printed thereon. The support plate also includes at least two pins extending from the conductive circuit of the support plate. Each of the at least two pins is connected to opposing (spaced apart) portions of the at least one heater.

    [0005] The electronic smoking article further comprises a reservoir, in an embodiment including an outer wall and having an oval cross-section. Moreover, the electronic smoking article can include a mouth end insert.

    [0006] Preferably, the at least one heater is a coil heater in communication with the at least one filamentary wick. The at least one filamentary wick comprises a first wick and a second wick. The first wick includes a first end extending into the reservoir and a second end in contact with the second wick. The at least one filamentary wick has a generally T-shape.

    [0007] In one embodiment, the at least one heater is upstream of the reservoir. In an alternative embodiment, the at least one heater is downstream of the reservoir.

    [0008] In one embodiment, an electronic smoking article comprises a heater element,
    a power source, a housing, and a support plate at a fixed location along said housing. The support plate includes first and second pins extending between first and second locations of the support plate to spaced apart locations along the heater, respectively, and connections at third and fourth locations of the support plate for establishing electrical connections between the plate and the power source, the third and fourth locations spaced from the first and second locations, the connections including first and second printed circuit elements electrically connecting the first and third locations and the second and third locations, respectively. The pins support and electrically connect the heater with the power source.

    Brief Description of the Drawings



    [0009] 

    Figure 1 is a side view of an electronic smoking article constructed according to the teachings herein.

    Figure 2 is a cross-sectional view of an electronic smoking article according to a first embodiment.

    Figure 3 is an enlarged view of a support plate for use in the electronic smoking article of Figure 2.

    Figure 4 is a truncated, cross-sectional view of a first section of an electronic smoking article according to a second embodiment.

    Figure 5 is a cross-sectional view of the first section of the electronic smoking article of Figure 4.

    Figure 6 is a perspective view of a support plate for use in the electronic smoking article of Figure 5.

    Figure 7 is a truncated, cross-sectional view of a first section of an electronic smoking article not according to the claims,

    Figure 8 is a perspective view of a support plate for use in the electronic smoking article of Figure 7.


    Detailed Description



    [0010] An electronic smoking article includes a liquid supply (reservoir or housing or source), the contents of which consist essentially of a wick and a liquid aerosol formulation.

    [0011] As used herein, the term "electronic smoking article" is inclusive of all types of electronic smoking articles, regardless of form, size or shape, including electronic cigarettes, electronic cigars, electronic pipes, electronic hookahs and the like. The liquid aerosol formulation can include nicotine or be nicotine free. Moreover, the liquid aerosol formulation can include tobacco flavors or instead, or in combination include other suitable flavors.

    [0012] The housing is otherwise essentially free of a fibrous material therein. The liquid aerosol formulation is delivered from the reservoir via the filamentary wick associated with a heater. The heater heats the liquid aerosol formulation and volatilizes it to form an aerosol. The reservoir is contained between a first gasket and a second gasket. The electronic cigarette also includes a support plate adjacent the first gasket or the second gasket. The support plate is operable to support the heater and the wick and facilitate connection of electrical leads to the heater.

    [0013] Preferably, as shown in Figures 1 and 2, the electronic smoking article 60 comprises a replaceable cartridge (or first section) 70 and a reusable fixture (or second section) 72, which are coupled together at a threaded joint 74 or by other convenience such as a snug-fit, snap-fit, detent, clamp and/or clasp. The first section 70 houses a mouth-end insert 27, a heater 19, a flexible filamentary wick 28 and a reservoir 14. The second section 72 houses a power supply 12, such as a battery, control circuitry 11, and optionally a puff sensor 16. The threaded portion 74 of the second section 72 can be connected to a battery charger when not connected to the first section 70 for use so as to charge the battery.

    [0014] Preferably, the first section 70 and the second section 72 include an outer cylindrical housing (casing) 22 extending in a longitudinal direction along the length of the electronic smoking article 60. In another embodiment, the outer housing 22 may comprise a single, unitary tube, without any threaded connections. Moreover, the outer housing 22 can include a window 110 (shown in Figure 1) that allows a smoker (vaporer) to view the amount of liquid aerosol formulation remaining in the reservoir 14. Alternatively, the outer casing can be translucent. In addition, the reservoir 14 can be refillable.

    [0015] In one embodiment, as shown in Figure 2, the first section 70 includes the outer housing (or casing) 22 extending in a longitudinal direction. As shown in Figure 2, the first section 70 can also include an inner tube (or chimney) 62 coaxially positioned within the outer housing 22. The inner tube 62 forms an air passage 21 therein.

    [0016] A first (upstream) gasket (or seal) 20 is fitted about an upstream end portion 65 of the inner tube 62, while at the same time, an outer perimeter 67 of the first (upstream), gasket 20 provides a liquid-tight seal with an interior surface 97 of the outer housing 22. A second (downstream) gasket 10 is fitted with a downstream end portion 81 of the inner tube 62. A central orifice 90 in the second gasket 10 allows for passage of air through the second gasket 10. The second gasket 10 can further include one or more additional holes positioned at opposing edges of the second gasket 10 through which the wick 28 can extend into the reservoir 14. Preferably, the wick 28 extends the full length of the reservoir 14.

    [0017] In this embodiment, the reservoir 14 is contained in an annulus between the inner tube 62 and the outer housing 22 and between the first gasket 20 and the second gasket 10. Moreover, the reservoir 14 extends longitudinally within the outer cylindrical housing 22 of the first section 70. Thus, the reservoir 14 at least partially surrounds the central air passage 21 in the embodiment shown in Figure 2. Preferably, the reservoir 14 comprises a liquid aerosol formulation which is volatilized when heated by the heater 19. Also preferably, the reservoir 14 does not include a liquid storage (retention), distribution medium, such as a fibrous material.

    [0018] In a preferred embodiment, the heater 19 comprises a wire coil which surrounds a portion of the wick 28. In that embodiment, preferably the wire is formed of an electrically resistive material, such as a nickel-chromium alloy. Preferably, the heater 19 is wrapped about a portion of the filamentary wick 28 and opposing ends 112, 112' of the filamentary wick 28 extend into the reservoir 14 so as to deliver the liquid aerosol formulation from the reservoir 14 to the heater 19. In this embodiment, the filamentary wick 28 can be substantially U-shaped.

    [0019] Also in a preferred embodiment, the electronic smoking article 60 includes a support plate 100 operable to support the heater 19 and the wick 28 and to establish an electrical connection between the battery 12 and the heater 19. The support plate 100 is positioned transverse to the longitudinal direction of the electronic smoking article 60. A conductive circuit 102 is printed on a surface of the support plate as shown in Figure 3. Electrical leads 26, 26' extend from a battery cathode connection and a central conductive post (anode) 104, which is the battery anode connection, through the reservoir 14 or through the air passage 21 (not shown) and to the printed, conductive circuit 102. Pins 106 extend from the printed, conductive circuit 102 and are connected to opposing ends of the heater 19 to form the electrical connection therewith via soldering, crimping or other suitable connections. In this embodiment, the support plate 100 is provided with an opening 91, which is aligned with the central orifice 90 of the downstream gasket 10.

    [0020] As shown in Figures 4 and 5, in a second embodiment, the first section can include a reservoir 14 having an outer wall 108 (Figure 5) that is substantially oval in cross-section. In this embodiment, no inner tube (nor central air passage) is positioned within the reservoir 14. Instead, the air passage 21 is provided between the outer housing 22 and the outer wall 108 of the reservoir as shown in Figure 5. Preferably, the electrical leads 26, 26' extend along the air passage 21, but can instead extend through the reservoir 14 as in other embodiments.

    [0021] Moreover, as shown in Figure 4, the second gasket 10 can include a single central orifice through which the filamentary wick 28 extends. A second wick 28' is connected to an end of the filamentary wick 28 to form a substantially T-shaped wick structure. The heater 19 is wrapped about the second wick 28'.

    [0022] As with the embodiment of Figures 2 and 3, the support plate shown in Figures 4 and 6 supports the heater 19 and provides an electrical connection therewith. As shown in Figure 6, the pins 106 are available for electrical connection with the leads 26, 26' and for electrical connections with the heater 19 via the printed circuit elements 102, 102' on the support plate 100. In this embodiment, the longitudinally extending wick 28 may be recited through the orifice 91 of the support plate 100.

    [0023] As shown in Figure 7, the electronic smoking article 60 can include the reservoir as shown in Figure 5. In addition, the electronic smoking article 60 can include a first wick 28 and a second wick 28'. As shown in Figure 8, the first wick 28 can he associated with a first heater 19 and the second wick 28' can be associated with a second heater 19'. In this embodiment, the support plate 100 can extend longitudinally within the electronic smoking article 60.

    [0024] The electronic smoking article 60 of each embodiment can also include at least one air inlet 40 operable (shown in Figures 1 and 2) to allow air to flow into the electronic smoking article 60 during smoking (vaping).

    [0025] Moreover, each embodiment includes the power supply 12, which can be a battery that is operable to apply voltage across the heater 19. The battery can be a Lithium-ion battery or one of its variants, for example a Lithium-ion polymer battery. The power supply 12 may be rechargeable and can include circuitry allowing the battery to be chargeable by an external charging device.

    [0026] The control circuitry 11 can be programmable and can include an application specific integrated circuit (ASIC). The control circuitry 11 can also include a heater activation light (or LED) 29 that is operable to glow when the heater 19 is activated.

    [0027] As shown in Figures 2, 4 and 7, the electronic smoking article 60 of each embodiment described herein can further include the mouth-end insert 27 having at least two off-axis, preferably diverging outlets 21. Preferably, the mouth-end insert 27 includes at least two diverging outlets 21. (e.g. 3, 4, 5, or preferably 6 to 8 outlets or more). Preferably, the outlets 21 of the mouth-end insert 27 are located at ends of off-axis passages 23 and are angled outwardly in relation to the longitudinal direction of the electronic smoking article 60 (i.e., divergently). As used herein, the term "off-axis" denotes at an angle to the longitudinal direction of the electronic smoking article.

    [0028] In a preferred embodiment, the electronic smoking article 60 is about the same size as a conventional smoking article. In some embodiments, the electronic smoking article 60 can be about 80 mm to about 110 mm long, preferably about 80 mm to about 100 mm long and about 7 mm to about 8 mm in diameter or greater. For example, in an embodiment, the electronic smoking article is about 84 mm long and has a diameter of about 7.8 mm.

    [0029] The outer cylindrical housing 22 of the electronic smoking article 60 may be formed of any suitable material or combination of materials. Preferably, the outer cylindrical housing 22 is formed of metal and may be operative as part of the electrical circuit.

    [0030] Preferably, the liquid aerosol formulation for use in each of the electronic smoking articles 60 described herein includes at least one aerosol former, optionally water, and flavors. The liquid aerosol formulation can include nicotine or be nicotine free. Moreover, the liquid aerosol formulation can include tobacco flavors or other suitable flavors.

    [0031] It is contemplated that the heater 19 in each embodiment can be positioned upstream or downstream of the reservoir 14.

    [0032] When the word "about" is used in this specification in connection with a numerical value, it is intended that the associated numerical value include a tolerance of ± 10% around the stated numerical value. Moreover, when reference is made to percentages in this specification, it is intended that those percentages are based on weight, i.e., weight percentages.

    [0033] Moreover, when the words "generally" and "substantially" are used in connection with geometric shapes, it is intended that precision of the geometric shape is not required but that latitude for the shape is within the scope of the disclosure. When used with geometric terms, the words "generally" and "substantially" are intended to encompass not only features which meet the strict definitions but also features which fairly approximate the strict definitions.


    Claims

    1. An electronic smoking article (60) operable to produce an aerosol, comprising:

    a liquid aerosol formulation;

    at least one filamentary wick (28) operable to transfer the liquid aerosol formulation;

    at least one heater (19) operable upon a portion of the at least one filamentary wick (28) to at least partially volatilize the liquid aerosol formulation and form the aerosol;

    a power supply (12) operable to apply voltage across the at least one heater (19); and

    a support plate (100) operable to support the at least one heater (19) and the at least one filamentary wick (28) and to form an electrical connection between the at least one heater (19) and the power supply (12), the support plate (100) having a surface, characterised by the surface of the support plate (100) being positioned to be transverse to a direction of air flow traveling through the electronic smoking article (60) while the electronic smoking article (60) is in operational use, and

    wherein the at least one filamentary wick (28) includes a first wick (28) and a second wick (28'), the first wick (28) including a first end extending into a reservoir, and the first wick (28) including a second end penetrating through an orifice in the support plate (100) and being connected to the second wick (28'), the first wick (28) and the second wick (28') collectively being T-shaped.


     
    2. The electronic smoking article (60) of claim 1, wherein the surface of the support plate (100) includes a conductive circuit (102) printed thereon.
     
    3. The electronic smoking article of claim 2, wherein at least two support pins (106) extend from the conductive circuit (102) of the surface of the support plate (100), each of the at least two support pins (106) being connected to opposing portions of the at least one heater (19).
     
    4. The electronic smoking article (60) of claim 1, further comprising:
    an outer wall (108) with an oval cross-section at least partially defining the reservoir (14) containing the liquid aerosol formulation.
     
    5. The electronic smoking article (60) of claim 1, further comprising:
    a mouth end insert (27) on an end of the electronic smoking article (60).
     
    6. The electronic smoking article (60) of claim 1, wherein the at least one heater (19) is a coil heater in communication with the at least one filamentary wick (28).
     
    7. The electronic smoking article (60) of claim 4, wherein the at least one heater (19) is at an end of the reservoir (14).
     
    8. The electronic smoking article (60) of claim 4, further comprising:
    an outer housing (22) extending in a longitudinal direction.
     
    9. The electronic smoking article (60) of claim 4, further comprising:

    a first section (70) attachable to a second section (72),

    wherein the at least one filamentary wick (28), the reservoir (14) and the at least one heater (19) are contained in the first section (70), and the power supply (12) is contained in the second section (72).


     
    10. The electronic smoking article (60) of claim 8, wherein the surface of the support plate (100) is about perpendicular to the longitudinal direction of the outer housing (22).
     


    Ansprüche

    1. Elektronischer Rauchartikel (60), betreibbar zum Erzeugen eines Aerosols, der Folgendes umfasst:

    eine flüssige Aerosolformulierung,

    mindestens einen fadenförmigen Docht (28) betreibbar zum Weiterleiten der flüssigen Aerosolformulierung,

    mindestens eine Heizeinrichtung (19), die an einem Abschnitt des mindestens einen fadenförmigen Dochts (28) betreibbar ist, um die flüssige Aerosolformulierung mindestens teilweise zu verflüchtigen und das Aerosol zu bilden,

    eine Energieversorgung (12), die betreibbar ist, um eine Spannung quer durch die mindestens eine Heizeinrichtung (19) anzulegen, und

    eine Stützplatte (100), die betreibbar ist, um die mindestens eine Heizeinrichtung (19) und den mindestens einen fadenförmigen Docht (28) zu stützen und eine elektrische Verbindung zwischen der mindestens einen Heizeinrichtung (19) und der Energieversorgung (12) zu bilden, wobei die Stützplatte (100) eine Oberfläche aufweist, dadurch gekennzeichnet, dass die Oberfläche der Stützplatte (100) so angeordnet ist, dass sie quer zu einer Richtung eines Luftstroms ist, der sich durch den elektronischen Rauchartikel (60) bewegt, während der elektronische Rauchartikel (60) in betrieblicher Verwendung ist, und

    wobei der mindestens eine fadenförmige Docht (28) einen ersten Docht (28) und einen zweiten Docht (28') einschließt, wobei der erste Docht (28) ein erstes Ende einschließt, das sich in ein Reservoir erstreckt, und der erste Docht (28) ein zweites Ende einschließt, das durch eine Öffnung in der Stützplatte (100) hindurchdringt und mit dem zweiten Docht (28') verbunden ist, wobei der erste Docht (28) und der zweite Docht (28') zusammen T-förmig sind.


     
    2. Elektronischer Rauchartikel (60) nach Anspruch 1, wobei die Oberfläche der Stützplatte (100) einen auf dieselbe gedruckten leitfähigen Kreis (102) einschließt.
     
    3. Elektronischer Rauchartikel (60) nach Anspruch 2, wobei sich mindestens zwei Stützstifte (106) von dem leitfähigen Kreis (102) der Oberfläche der Stützplatte (100) aus erstrecken, wobei jeder von den mindestens zwei Stützstiften (106) mit entgegengesetzten Abschnitten der mindestens einen Heizeinrichtung (19) verbunden ist.
     
    4. Elektronischer Rauchartikel (60) nach Anspruch 1, der ferner Folgendes umfasst:
    eine äußere Wand (108) mit einem ovalen Querschnitt, die mindestens teilweise das Reservoir (14) definiert, das die flüssige Aerosolformulierung enthält.
     
    5. Elektronischer Rauchartikel (60) nach Anspruch 1, der ferner Folgendes umfasst:
    einen Mündungsendeinsatz (27) an einem Ende des elektronischen Rauchartikels (60).
     
    6. Elektronischer Rauchartikel (60) nach Anspruch 1, wobei die mindestens eine Heizeinrichtung (19) eine Wendelheizeinrichtung in Verbindung mit dem mindestens einen fadenförmigen Docht (28) ist.
     
    7. Elektronischer Rauchartikel (60) nach Anspruch 4, wobei sich die mindestens eine Heizeinrichtung (19) an einem Ende des Reservoirs (14) befindet.
     
    8. Elektronischer Rauchartikel (60) nach Anspruch 4, der ferner Folgendes umfasst:
    ein äußeres Gehäuse (22), das sich in einer Längsrichtung erstreckt.
     
    9. Elektronischer Rauchartikel (60) nach Anspruch 4, der ferner Folgendes umfasst:

    eine erste Sektion (70), die an einer zweiten Sektion (72) befestigt werden kann,

    wobei der mindestens eine fadenförmige Docht (28), das Reservoir (14) und die mindestens eine Heizeinrichtung (19) in der ersten Sektion (70) enthalten sind und die Energieversorgung (12) in der zweiten Sektion (72) enthalten ist.


     
    10. Elektronischer Rauchartikel (60) nach Anspruch 8, wobei die Oberfläche der Stützplatte (100) etwa senkrecht zu der Längsrichtung des äußeren Gehäuses (22) ist.
     


    Revendications

    1. Article à fumer électronique (60) utilisable pour produire un aérosol, comprenant :

    une formulation d'aérosol liquide ;

    au moins une mèche filamenteuse (28) utilisable pour transférer la formulation d'aérosol ;

    au moins un élément chauffant (19) utilisable sur une partie de l'au moins une mèche filamenteuse (28) pour volatiliser au moins partiellement la formulation d'aérosol liquide et former l'aérosol ;

    une alimentation électrique (12) utilisable pour appliquer une tension de part et d'autre de l'au moins un élément chauffant (19) ; et

    une plaque de support (100) utilisable pour supporter le au moins un élément chauffant (19) et l'au moins une mèche filamenteuse (28) et pour établir une connexion électrique entre le au moins un élément chauffant (19) et l'alimentation électrique (12), la plaque de support (100) ayant une surface, caractérisé en ce que la surface de la plaque de support (100) est positionnée de sorte à être transversale à la direction d'un écoulement d'air s'écoulant à travers l'article à fumer électronique (60) pendant que l'article à fumer électronique (60) est utilisé ; et

    dans lequel l'au moins une mèche filamenteuse (28) inclut une première mèche (28) et une deuxième mèche (28'), la première mèche (28) incluant une première extrémité s'étendant dans un réservoir, et la première mèche (28) incluant une deuxième extrémité pénétrant à travers un orifice dans la plaque de support (100) et étant connectée à la deuxième mèche (28'), la première mèche (28) et la deuxième mèche (28') ayant collectivement une forme en T.


     
    2. Article à fumer électronique (60) selon la revendication 1, dans lequel la surface de la plaque de support (100) inclut un circuit conducteur (102) qui y est imprimé.
     
    3. Article à fumer électronique selon la revendication 2, dans lequel au moins deux broches de support (106) s'étendent à partir du circuit conducteur (102) de la surface de la plaque de support (100), chacune des au moins deux broches de support (106) étant connectée à des parties opposées du au moins un élément chauffant (19).
     
    4. Article à fumer électronique (60) selon la revendication 1, comprenant en outre :
    une paroi externe (108) avec une section transversale ovale définissant au moins partiellement le réservoir (14) contenant la formulation d'aérosol liquide.
     
    5. Article à fumer électronique (60) selon la revendication 1, comprenant en outre :
    un insert d'extrémité buccale (27) sur une extrémité de l'article à fumer électronique (60).
     
    6. Article à fumer électronique (60) selon la revendication 1, dans lequel le au moins un élément chauffant (19) est un élément chauffant à serpentin en communication avec l'au moins une mèche filamenteuse (28).
     
    7. Article à fumer électronique (60) selon la revendication 4, dans lequel le au moins un élément chauffant (19) est disposé au niveau d'une extrémité du réservoir (14).
     
    8. Article à fumer électronique (60) selon la revendication 4, comprenant en outre :
    un boîtier externe (22) s'étendant dans une direction longitudinale.
     
    9. Article à fumer électronique (60) selon la revendication 4, comprenant en outre :

    une première section (70) pouvant être fixée sur une deuxième section (72) ;

    dans lequel l'au moins une mèche filamenteuse (28), le réservoir (14) et le au moins un élément chauffant (19) sont contenus dans la première section (70), et l'alimentation électrique (12) est contenue dans la deuxième section (72).


     
    10. Article à fumer électronique (60) selon la revendication 8, dans lequel la surface de la plaque de support (100) est à peu près perpendiculaire à la direction longitudinale du boîtier externe (22).
     




    Drawing














    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description