• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An electric heater comprising a support (2) and a heating layer (3) of carbon fiber composite on the support and connected to a power supply for heating the device. The heating layer (3) has a volume that includes an electrically conductive circuit portion (4) that extends along at least one continuous line, and an electrically insulating insulation portion (5) that fills the rest of the volume of the heating layer.
    公开号:FR3015172A1
    申请号:FR1362509
    申请日:2013-12-12
    公开日:2015-06-19
    发明作者:Alexandre Lewandowski；Franck Rey-Bethbeder；Dominique Delaporte；Alain Lechon；Maurice Geli；Yann Buzare
    申请人:Total SE；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD The present invention relates to an electric heating device, for example a heating pipe for the transport of a fluid requiring at least occasionally heating, said fluid comprising for example a hydrocarbon.
    [0002] STATE OF THE PRIOR ART More particularly, the invention relates to an electric heating device comprising: a support which extends along a surface, a heating layer located on said support, said heating layer comprising a first conductive material, electricity, said first material comprising first carbon fibers embedded in a first polymer matrix, and said heating layer being adapted to be connected to a power supply for heating said device. The device can take various forms. It may be a substantially flat plate, or a curved plate, or a flexible membrane for example of elastomer, or a pipe.
    [0003] A heating pipe is for example used for the transport of a fluid comprising a hydrocarbon, as described in document FR-2958991. Indeed, these pipes are commonly used in very cold environments, both on land and at sea, and sometimes at sea at a very great depth. Under these conditions, the fluid can either freeze or coagulate, or present the formation of paraffin or hydrates, which can generate plugs and impede the transport of fluid in the pipe. This is why the pipes are sometimes heated, for example by the Joule effect of an electric current passing in a conductive layer.
    [0004] A flexible heating membrane or heating blanket is described in document FR-2958994. This heating blanket is for example wrapped around a non-heating pipe to heat the fluid.
    [0005] All of these devices include a carbon fiber heating layer that extends over the entire surface of their support. SUMMARY OF THE INVENTION The present invention aims to improve the previous electric heaters. For this purpose, a device of this type is characterized in that the heating layer has a volume which comprises: a circuit part composed of the first electrically conductive material and which extends along at least one continuous line between ends connected directly or indirectly to the power supply, and - an insulation part composed of a second non-electrically conductive material and which fills the remainder of the volume of the heating layer, said insulation portion electrically isolating the circuit part in the heating layer.
    [0006] Thanks to these provisions, the heating can be located mainly in the surface of the heating layer corresponding to the circuit part. This makes it possible to adapt the heating device, to heat only necessary areas, and to spend less electrical energy. In addition, it allows to put in a single heating layer several power lines, and thus to complicate the electrical circuit. In particular, it is possible to use a multi-phase, two-phase or three-phase power supply. It is also possible to make in the same heating layer the return of a first line in a second line. The electrical connection of the heating layer can thus be simplified and in particular located at a single location of the electric heating device. Finally, it is avoided to stack several heating layers, isolated from each other by an intermediate layer of electrical insulation. It is thus possible to obtain a heating device with a reduced thickness. In various embodiments of the device according to the invention, one or more of the following arrangements may also be used. According to one aspect of the invention, the second material comprises second fibers embedded in a second polymer matrix, said second fibers being non-electrically conductive. According to one aspect of the invention, the second fibers are glass fibers. According to one aspect of the invention, the polymer of the second matrix is identical to the polymer of the first matrix. According to one aspect of the invention, the circuit portion comprises at least two continuous lines and separated from each other by separation portions of the insulation portion. According to one aspect of the invention, the circuit part comprises three continuous lines and separated from each other by separation portions of the insulation part, each line being supplied by a phase of a three-phase power supply. . According to one aspect of the invention, each line comprises a line section in a plane substantially perpendicular to the surface, said line sections being alternated with the insulation portion separation portions in at least a first direction of said plane substantially parallel to the surface.
    [0007] According to one aspect of the invention, the line sections are alternately shifted in a second direction substantially perpendicular to the first direction and in a direction opposite to said second direction. According to one aspect of the invention, the line sections have substantially all the same surface. According to one aspect of the invention, the line sections have a shape at least twice as elongated in the first direction as in a second direction substantially perpendicular to the first direction. According to one aspect of the invention, the heating layer is formed by depositing on the support a plurality of first composite strips composed of the first material and a plurality of second composite strips composed of the second material, deposition positions. said first and second composite strips determining formation of the circuit portion and the insulation portion of the heating layer. According to one aspect of the invention: the support is a hollow tube extending in a longitudinal direction and intended to carry a fluid comprising a hydrocarbon, said tube having at least one electrically insulating outer surface, and the heating is substantially a cylindrical layer above the tube. According to one aspect of the invention, the line has a helical shape around said tube, and the insulation portion has a separation portion that extends between each turn of the helix. According to one aspect of the invention, the carrier is a flexible membrane for covering at least one area of a fluid carrying device comprising a hydrocarbon, and the heating layer is a layer which covers at least one face of said membrane.
    [0008] BRIEF DESCRIPTION OF THE DRAWINGS Other features and advantages of the invention will emerge during the following description of at least one of its embodiments, given by way of non-limiting example, with reference to the accompanying drawings. In the drawings: FIG. 1a is a longitudinal sectional view of a first embodiment of a composite heating pipe according to the invention; FIG. 1b is a transverse side view of the pipe of FIG. FIG. 2 is a perspective view of a second embodiment of a heating pipe according to the invention; FIGS. 3a to 3f are transverse views of heater heating layers such as a pipe or cover; FIG. 4 is a perspective view of an embodiment of a heating blanket according to the invention. In the different figures, the same reference numerals designate identical or similar elements. DETAILED DESCRIPTION OF EMBODIMENTS In the present description, the terms "forward" and "backward" are used longitudinally X. The terms "top" and "bottom" or "30 relative to the direction relative to the" top "direction or "downwardly" are vertical Z, used upwards, and perpendicular to the longitudinal direction X transverse direction Y. The electric heating device of the present invention may be a heating blanket, a heating plate, a heating pipe, or any other device of any shape which comprises a surface covered with a so-called "heating layer" layer. This heating layer comprises carbon fibers embedded in a polymer matrix, said carbon fibers making it possible to pass an electric current which heats the layer by Joule effect. The term "cover" of the present invention is to be understood as a device having a flexible, deformable membrane shape for surrounding or wrapping a fluid carrier, such as a conduit, a valve, or a wellhead. The term "conduit" of the present invention is to be understood as being a device comprising a tube for conveying fluid at least between an inlet and an outlet, the device may comprise other elements, such as a valve, or taps multiple. Document FR-2958991 describes a pipe comprising a single heating layer comprising carbon fibers for conducting electricity, and layers of electrical insulation (for example fiberglass). It is possible to superpose several layers of heating by interposing an insulation layer between each heating layer, in order to build a multilayer pipe. For example, one can have a pipe with two stacked heating layers, the second heating layer providing electrical return to a single supply end. For example, one can have a pipe with three stacked heating layers, adapted for example to a three-phase power supply.
    [0009] Figures 1a, 1b and 2 show a pipe 1 according to the invention in longitudinal section along the XZ plane and in cross section along the YZ plane. In these figures, only one upper half above the X axis is shown, the other lower half being substantially identical by symmetry with respect to the X axis. However, it will be understood that any device with or without symmetry is possible. Line 1 comprises a hollow tube 2, extending in the longitudinal direction of axis X between first and second ends 1a, 1b. This tube 2 comprises an inner surface 2a near the X axis, and an outer surface 2b further from the X axis. Inside the inner surface 2a extends a cavity 2c between an inlet and an outlet of the cavity located at each end. The cavity 2c is adapted to transport the fluid between said inlet and outlet. Line 1 has a substantially cylindrical section in the YZ plane, but other shapes could be made. The tube 2 may be made of an electrically conductive material, such as steel, as shown in the figures. The tube 2 can be made of an electrically nonconductive (insulating) material, for example a polymer. This material may be a polyamide (PA), or a polyvinylidene fluoride (PVDF). This material may also be a composite material comprising fibers embedded in a polymer matrix. These fibers are for example glass. The outer surface 2b of this tube 2 is a support. Around this support (for example on this support), there is at least one heating layer 3. The pipe may comprise other layers. For example, the tube may be covered with a protective layer to limit corrosion of said tube, usually steel. For example, the tube may also be coated with an adhesion layer to facilitate adhesion of the next layer (heating layer 3) to said tube. For example, the conduit may also include a thermal insulation layer, for example over the heating layer 3. For example, the conduit may also include one or more layers of electrical insulation, below or above the heating layer 3. The heating layer 3 is a composite comprising at least a first electrically conductive material, composed of first carbon fibers embedded in a first polymer matrix. This polymer is advantageously an epoxy resin, a polyamide (PA), or a polyvinylidene fluoride (PVDF). The carbon fibers are able to conduct an electric current to heat the tube by Joule effect. The resistivity of carbon fibers, for example having the value of carbon pf -1.9.10-51-IM at a temperature of 20 ° C, which is substantially 1100 times more resistive than copper at 20 ° C. Therefore, when such a material is used to make a heating layer, it covers the entire surface of the support over a certain thickness in order to obtain the desired linear resistivity. However, this resistivity remains extremely low compared to an insulating material such as glass. The resistivity of the glass has, for example, a value of 20. The heating layer 3 according to the invention is thus a composite which covers the tube 2, but it is more complex than those of the prior art. It comprises two parts in its volume: a circuit part 4, made with the first electrically conductive material, namely first carbon fibers embedded in a first polymer matrix, and an insulation part 5, made with a second non-electrically conductive material, and which fills the remainder of the volume of the heating layer to electrically isolate the circuit portion in the heating layer. The circuit portion 4 further extends along at least one continuous line between ends which are connected directly or indirectly to electrical supply means which bring the electric current to the heating layer 3 to heat the line 1. The heating layer 3 according to the invention is therefore not a continuous layer of electrically conductive material 5 covering the surface of the support (example: tube). The heating layer comprises at least one electrically isolated conductive circuit in a non-conductive material. It is thus possible to design a heating layer 3 with a circuit adapted to heat predetermined areas. We spend less electrical energy. The second material is advantageously composed of second fibers embedded in a second polymer matrix. These second fibers are non-electrically conductive (insulating). The heating layer 3 is therefore a composite comprising two types of fibers: carbon-conducting fibers and non-conductive fibers. Thanks to this composite structure with fibers, the heating layer 3 is mechanically very strong. Alternatively, the second fibers are made of glass or aramid (for example a para-aramid sold under the trade name kevlar). The heating layer 3 is thus even more mechanically resistant. Alternatively, the first and / or second fibers are a mixture of fibers. For example, the first fibers are a mixture of carbon fibers and glass fibers, or a mixture of carbon fibers and aramid fibers. For example, the second fibers are a blend of glass fibers and aramid fibers. The electrical conductivities of the circuit part 4 and the insulating part 5 can thus be predetermined and each adapted to the application. Alternatively, the polymer of the second matrix and the polymer of the first matrix are identical. The heating layer 3 thus forms a single composite with the same polymer matrix. This layer thus has a continuity of material which makes it even more mechanically resistant. The heating layer 3 of the pipe 1 is, for example, manufactured by known means using preformed composite strips of two types (composed of the first material or the second material), each preformed strip extending in one direction and comprising fibers (carbon, glass or Kevlar) embedded in a polymer matrix. The fibers are optionally oriented in the direction of the preformed strip. The volume of the heating layer 3 extends for example in a constant thickness on the support, (tube 2), in a direction perpendicular to its surface. The heating layer 3 of the pipe 1 is a cylindrical layer located on the pipe 2. The heating layer 3 of the pipe 1 shown in FIG. 1b comprises a circuit part 4 comprising four lines arranged inside the pipe 1. heating layer 3, each line being covered on all its lateral sides by the insulation part 5. In particular, the insulation part 5 comprises separation portions 5a located between each line to separate them from each other, and thus electrically isolate them. However, the heating layer 3 of the invention may comprise a single line, two lines, or three or more lines. The positions, longitudinal or transverse shapes of these lines may also vary. Thanks to a single heating layer 3 which comprises a plurality of electrically conductive lines, it avoids the alternating stacking of heating layers and insulation layers of the prior art, in which these layers cover each time any the surface of the support. The heating device according to the invention therefore has a smaller thickness (smaller dimension in the second direction R1).
    [0010] For example, each line of the circuit portion 4 may be a substantially straight line extending in the longitudinal direction X, or a line extending in a direction inclined with respect to the longitudinal direction X. In the section of FIG. 1b, in a plane perpendicular to the longitudinal direction X, each line has a line section 4a having a predetermined shape, for example a rectangle shape or a curved rectangle shape to adapt to the shape of the tube . This section of line 4a makes it possible to pass the electric current necessary for heating line 1. In a variant, each line may extend in any predetermined curve above the support (tube 2). Each line forms a wire or conductive element of a circuit. The ends of the lines are able to be connected directly or indirectly to electrical supply means for passing current. The type of power supply (direct current, alternating current, two-phase or three-phase current) is adapted to the number of lines in the circuit part 4 and to their characteristics (line section 4a, line length, resistivity of the material). Line ends located at one end of the pipe are optionally interconnected to form a star electric circuit more suitable for a multiphase type supply. The electrical connection is thus simplified, and on one side of the device 1. Alternatively, the lines are independent of each other. Optionally, the power supply includes switching means for powering one or more of the available lines. The heating of the device can thus be regulated. In FIG. 2, the pipe 1 comprises a circuit part 4 which comprises three reference lines 41, 42 and 43.
    [0011] Each line forms a helix around the tube 2 which extends round after turn around the tube in the longitudinal direction X. The helices of the three lines are nested one inside the other, so that in the longitudinal direction X the lines 41, 42 and 43 are alternated. The first and second ends la, lb and have in their cross section of the same line sections. The insulating portion 5 of the heating layer 3 of this heating pipe 1 comprises separation portions 5a which extend between each revolution of the helix of a line and / or between each line 41, 42 and 43. The turns of the helix of a line are isolated from each other, and the lines are isolated from each other. This line 1 to three lines is advantageously supplied with a three-phase power supply. FIGS. 3a to 3f show alternative sections of a heating device 1, making it possible to illustrate variant positions and line section shapes 4a of said device.
    [0012] For example, the representations of these sections correspond to cylindrical pipe sections shown in developed in a first rectilinear direction T corresponding to a direction tangential to the pipe. The second directions R1, R2, R3 correspond to radial directions of the pipe. For example, these representations can thus also correspond to substantially flat heating cover sections and as described below, and illustrated in FIG. 4, the first direction corresponding to a direction in the plane of coverage (surface S), and the second direction R1 corresponding to a direction perpendicular or normal to this surface. These figures can thus represent sections of pipes having two lines. In this case, it is considered that the direction R1 corresponds to an angular position of 0 °, that the direction R2 corresponds to an angular position of 180 °, and that the direction R3 corresponds to an angular position of 360 °. But, these figures can represent cuts of pipes with fewer lines or more lines, the pattern being repeatable or periodic. It suffices to define the values of the angular positions of directions R1, R2 and R3. According to a first variant in FIG. 3a, the line sections 4a of the two lines 41 and 42 are rectangular sections separated and isolated from each other in the first direction T by the separation portion 5a of the insulating part 5. The lines 41 and 42 are also separated or isolated in the second directions R1, R2, R3 by insulating layers 5b of the insulating part 5.
    [0013] These separations or insulations are filled with the second non-electrically conductive material of the insulating portion 5. Thus, the lines are wrapped in this electrical insulating material. According to a second variant in FIG. 3b, the line sections 4a are furthermore offset in the second direction R1 alternately (one in two in the first direction T). The insulating portion 5 has a hook or slot shape passing below a first line and then above a second adjacent line 30 (alternately above and below the lines). According to a third variant in FIG. 3c, the thicknesses in the second direction R1 of the lines (circuit part 4) and of the insulating part 5 are identical. Each line thus has a thickness which is half the thickness of the heating layer 3. According to a fourth variant in FIG. 3d, the line sections 4a are no longer rectangular but in the form of a diamond, so that they have faces inclined with respect to the second direction R1. According to a fifth variant in FIG. 3e, the line sections 4a have a trapezoidal shape. The line sections 4a are alternately (one in two in the first direction T) inverted. A second line has a trapezoid shape inverted from that of a first line. The successive and adjacent trapezes are combined so that the separating portion 5a separating them has a substantially constant thickness. According to a sixth variant in FIG. 3f, the line sections 4a have different surfaces and / or shapes. For example, a first line 41 close to the support 2 covers it entirely. Then, an insulating layer 5b of the insulating portion 5 completely covers this first line. Then, several lines 42, 43 are located on this insulating layer 5b and are separated from each other by separation portions 5a. FIG. 4 shows another type of electric heating device 1 according to the invention: a heating blanket.
    [0014] This substantially flexible heating blanket 1 extends along a surface S approximately in an XY plane. It comprises a first face Fl (lower face) and a second face F2 (upper face) in the direction Z.
    [0015] In this direction Z, the heating blanket 1 consists of at least: a substantially plane support 2 and a heating layer 3 on said support 2. The heating layer 3 comprises a circuit part 4 and an insulation portion 5. The circuit portion 4 comprises at least one continuous line between ends connected directly or indirectly to the power supply. The insulating portion 5 electrically insulates the line in the heating layer 3 at least in the 5 directions of the surface S (XY plane of Fig. 4) by separation portions 5a. With these features, the heating layer 3 forms an electrical circuit that can be predetermined to warm more areas and to heat other areas. One line may be the return of another, and the electrical connections are simplified and / or united on one side of the device. The heating blanket has fewer overlapping layers (heating layer / insulation layer) and is therefore more flexible.
    [0016] The geometrical arrangements of the heating layer 3 in a cross-section (XZ plane) may be similar to those described in FIGS. 3a-3f. The arrangements of the materials composing the circuit part 4 and the insulating part 5 may be identical to the arrangements described for the heating pipe 1 (FIGS. 1-2). The matrix used for the various composite materials is advantageously an elastomer-type polymer. The cover 1 is thus flexible.
    [0017] All variants envisaged for line 1 and its feed are also possible for the present heating blanket.
    权利要求:
    Claims (14)
    [0001]
    REVENDICATIONS1. Electric heating device comprising: - a support (2) which extends along a surface (S), - a heating layer (3) located on said support, said heating layer comprising a first electrically conductive material, said first material comprising first carbon fibers embedded in a first polymer matrix, and said heating layer being intended to be connected to a power supply for heating said device, said device being characterized in that the heating layer (3) has a volume which comprises: - a circuit part (4) composed of the first electrically conductive material and which extends along at least one continuous line between ends directly or indirectly connected to the power supply, and - a part insulation (5) composed of a second non-electrically conductive material and which fills the rest of the volume of the heating layer, said portion ie insulation electrically isolating the circuit portion in the heating layer. 25
    [0002]
    2. Device according to claim 1, wherein the second material comprises second fibers embedded in a second polymer matrix, said second fibers being non-electrically conductive. 30
    [0003]
    3. Device according to claim 2, wherein the second fibers are glass fibers.
    [0004]
    4. The device of claim 2 or claim 3, wherein the polymer of the second matrix is identical to the polymer of the first matrix.
    [0005]
    5. Device according to any one of claims 1 to 4, wherein the circuit portion (4) comprises at least two lines (42, 42) continuous and separated from one another by separation portions (5a). ) of the insulation part (5).
    [0006]
    6. Device according to any one of claims 1 to 4, wherein the circuit portion (4) comprises three continuous lines and separated from one another by separation portions (5a) of the insulation portion. (5), each line being powered by a phase of a three-phase power supply.
    [0007]
    The device of claim 5, wherein each line (42,42) comprises a line section (4a) in a plane substantially perpendicular to the surface (S), said line sections being alternated with the separation portions (5a). insulation portion (5) in at least a first direction (T) of said plane substantially parallel to the surface (S).
    [0008]
    8. Device according to claim 6, wherein the line sections (4a) are alternately offset in a second direction (R1) substantially perpendicular to the first direction (T) and in a direction opposite to said second direction.
    [0009]
    9. Device according to any one of claims 5 to 8, wherein the line sections (4a) have substantially all the same surface.
    [0010]
    10. Device according to any one of claims 5 to 9, wherein the line sections (4a) have a shape at least twice as elongated in the first direction (T) as in a second direction (R1) substantially perpendicular in the first direction.
    [0011]
    11. Device according to any one of claims 1 to 10, wherein the heating layer (3) is formed by depositing on the support (2) a plurality of first composite strips composed of the first material and a plurality second composite strips composed of the second material, deposition positions of said first and second composite strips 10 determining the formation of the circuit portion (4) and the insulation portion (5) of the heating layer (3).
    [0012]
    12. Device according to one of claims 1 to 11, wherein: the support (2) is a hollow tube extending in a longitudinal direction (X) and intended to carry a fluid comprising a hydrocarbon, said tube ( 2) having at least one electrically insulative outer surface (2b), and - the heating layer (3) is substantially a cylindrical layer above the tube.
    [0013]
    The device of claim 12, wherein the line is helically shaped around said tube, and the insulating portion (5) has a separation portion (5a) extending between each turn of the helix. .
    [0014]
    14. Device according to one of claims 1 to 11, wherein the support (2) is a flexible membrane intended to cover at least one zone of a fluid transport device 30 comprising a hydrocarbon, and the layer of heating (3) is a layer which covers at least one side of said membrane.
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    FR2477660A1|1981-09-11|Sealing joint between metal pipes - in which medium laid around holes is electrically fused
    同族专利:
    公开号 | 公开日
    FR3015172B1|2019-05-10|
    US20160316518A1|2016-10-27|
    WO2015086963A1|2015-06-18|
    BR112016013459B1|2021-02-02|
    US10743372B2|2020-08-11|
    EP3080508A1|2016-10-19|
    AR098719A1|2016-06-08|
    EP3080508B1|2021-04-28|
    UY35878A|2015-07-31|
    引用文献:
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    TWI425071B|2011-10-07|2014-02-01|Nat Univ Tsing Hua|Method for joining components by utilizing ohmic heating to cure carbon nanotube-epoxy composite adhesive|
    US10201039B2|2012-01-20|2019-02-05|Gentherm Gmbh|Felt heater and method of making|FR3050356B1|2016-04-18|2018-05-04|Saipem S.A.|ELECTRICAL INSTALLATION FOR ELECTRICAL HEATING SYSTEM BY TRACING A METAL FLUID TRANSPORT PIPE AND ELECTRICAL HEATING METHOD BY TRACING SUCH A CONDUCT|
    EP3497359B1|2016-08-15|2020-10-07|Parker-Hannifin Corporation|Wrapped hose heater assembly with hot pocket configuration|
    CN107524883A|2017-08-10|2017-12-29|苏州妙文信息科技有限公司|The pipe-line system and its heating means of a kind of homogeneous heating|
    KR101940139B1|2017-11-24|2019-01-18|신우에이엔티|Heating jacket for manufacturing device of semiconductor and display panel, and heating jacket forming unit|
    CN109027497B|2018-08-29|2021-04-13|西安石油大学|Spiral flow drag reduction fluid transportation pipeline for petrochemical fluid heat exchange|
    CN111043434A|2019-12-24|2020-04-21|太原航空仪表有限公司|High-safety heating pad|
    CN112728227A|2020-12-24|2021-04-30|北京市水利规划设计研究院|Water delivery pipe, rocker arm water delivery device and water taking pump ship|
    法律状态:
    2015-11-23| PLFP| Fee payment|Year of fee payment: 3 |
    2016-11-21| PLFP| Fee payment|Year of fee payment: 4 |
    2017-11-21| PLFP| Fee payment|Year of fee payment: 5 |
    2018-11-27| PLFP| Fee payment|Year of fee payment: 6 |
    2019-11-20| PLFP| Fee payment|Year of fee payment: 7 |
    2020-11-20| PLFP| Fee payment|Year of fee payment: 8 |
    2021-12-24| PLFP| Fee payment|Year of fee payment: 9 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1362509|2013-12-12|
    FR1362509A|FR3015172B1|2013-12-12|2013-12-12|ELECTRICAL HEATING DEVICE|FR1362509A| FR3015172B1|2013-12-12|2013-12-12|ELECTRICAL HEATING DEVICE|
    BR112016013459-1A| BR112016013459B1|2013-12-12|2014-12-05|electric heating device|
    EP14827475.6A| EP3080508B1|2013-12-12|2014-12-05|Electric heating device|
    US15/104,171| US10743372B2|2013-12-12|2014-12-05|Electric heating device|
    PCT/FR2014/053186| WO2015086963A1|2013-12-12|2014-12-05|Electric heating device|
    ARP140104618A| AR098719A1|2013-12-12|2014-12-11|ELECTRICAL WARMING DEVICE|
    UY0001035878A| UY35878A|2013-12-12|2014-12-12|? ELECTRICAL WARMING DEVICE?|
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