Classifications

• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
  • A41D31/00—Materials specially adapted for outerwear
  • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
  • A41D31/08—Heat resistant; Fire retardant
  • A41D31/085—Heat resistant; Fire retardant using layered materials
• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
  • A41D31/00—Materials specially adapted for outerwear
  • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
  • A41D31/06—Thermally protective, e.g. insulating
  • A41D31/065—Thermally protective, e.g. insulating using layered materials
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
  • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
  • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
• • A—HUMAN NECESSITIES
  • A62—LIFE-SAVING; FIRE-FIGHTING
  • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
  • A62B17/00—Protective clothing affording protection against heat or harmful chemical agents or for use at high altitudes
  • A62B17/003—Fire-resistant or fire-fighters' clothes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2250/00—Layers arrangement
  • B32B2250/20—All layers being fibrous or filamentary
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
  • B32B2262/02—Synthetic macromolecular fibres
  • B32B2262/0261—Polyamide fibres
  • B32B2262/0269—Aromatic polyamide fibres
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
  • B32B2262/04—Cellulosic plastic fibres, e.g. rayon
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
  • B32B2262/06—Vegetal fibres
  • B32B2262/062—Cellulose fibres, e.g. cotton
  • B32B2262/065—Lignocellulosic fibres, e.g. jute, sisal, hemp, flax, bamboo
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
  • B32B2262/10—Inorganic fibres
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
  • B32B2262/10—Inorganic fibres
  • B32B2262/101—Glass fibres
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2305/00—Condition, form or state of the layers or laminate
  • B32B2305/10—Fibres of continuous length
  • B32B2305/18—Fabrics, textiles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/30—Properties of the layers or laminate having particular thermal properties
  • B32B2307/304—Insulating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/30—Properties of the layers or laminate having particular thermal properties
  • B32B2307/306—Resistant to heat
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/30—Properties of the layers or laminate having particular thermal properties
  • B32B2307/306—Resistant to heat
  • B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/718—Weight, e.g. weight per square meter
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/732—Dimensional properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2437/00—Clothing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2571/00—Protective equipment

Definitions

• the present invention relates to a heat shielding composite cloth.
• cloth is analogous and equivalent to tissue, fabric, textile, web and the like.
• Thermally responsive cloths such as heath shielding composite cloths are employed for example to manufacture gauntlets for workers operating on high temperature pipes, as well as fire fighter vests so as to protect a wearer from a high temperature environment or situation.
• the working principle of heath shielding composite cloths is known in the art and consists in adjusting the distance between a pair of parallel layers made of a thermally insulating material that are restrained to each other by an element made of an intelligent material such as a shape memory material, typically a shape memory polymer or a shape memory alloy.
• a shape memory material typically a shape memory polymer or a shape memory alloy.
• Shape memory alloys are characterized by a transition between two phases, one stable at a lower temperature, the so-called Martensite phase, one stable at a higher temperature, the so-called Austenite phase.
• a shape memory alloy is characterized by four temperatures, Mf, Ms, As, and Af, where Mf is the temperature below which the shape memory alloy is completely in the Martensite phase, i.e. it has a martensitic structure, while Af is the temperature above which the shape memory alloy is fully in the Austenite phase, i.e. it has an austenitic structure, whereas Ms, As are the temperatures at which the martensitic and austenitic transitions start, respectively.
• Wires made of a shape memory alloy can be trained to change their shape when temperature changes from below Mf to above Af, and viceversa. Processing and training of SMA wires are widely known procedures in the field, as exemplified by "Shape Memory Alloy Shape Training tutorial” dating back to the Fall 2004 training section “ME559 - Smart Materials and Structures”.
• shape memory alloy wires for heath shielding composite cloths is disclosed in US patent 6312784. However, this document only provides a generic disclosure of the fact that shape memory alloy filiform elements may be suitably employed for the manufacturing of these cloths, but does not provide enabling information on their essential constitutional features.
• the international patent application WO 1999/005926 discloses the use of shape memory alloy elements for thermally adaptive systems, wherein shape memory alloy elements are used as inserts between a pair of layers.
• shape memory alloy elements in the manufacturing of heath shielding or insulating products is also disclosed in the international patent application WO 2008/044814, in the US patent application US 2013/023930, as well as in the international patent application WO 2017/096044.
• the purpose of the present invention is to improve heat shielding composite cloths with the specific aim to achieve a reliable and consistent actuation over time and to better exploit the forces exerted by the shape memory alloy wires movably connecting to each other a pair of layers made of a thermally insulating material.
• the invention consists in a heat shielding composite cloth comprising an upper layer and a lower layer that are made of a thermal insulating material and are movably connected to one another by one or more of Shape Memory Alloy (SMA) wires, characterized in that at a temperature equal to or above the Austenite phase temperature Af the following relationships are satisfied:
• the ratio Lu/Ll is comprised between 0.1 and 10
• - Lu is the sum of lengths of the portions of shape memory alloy wires that are restrained to the upper layer over an area of 3 cm 2 of the composite cloth,
• - LI is the sum of lengths of the portions of shape memory alloy wires that are restrained to the lower layer over the same area of 3 cm 2 of the composite cloth,
• - H is the sum of lengths of the portions of shape memory alloy wires that are arranged between the upper layer and the lower layer and are not restrained thereto over the same area of 3 cm 2 of the composite cloth, the overall configuration of the heat shielding composite cloth being such that at a temperature equal to or above the Austenite phase temperature Af the distance between the upper and lower layers starting from a minimal distance comprised between 0 and 5 mm is increased by an amount comprised between 1 and 40 mm.
• the minimal distance is referred to a temperature equal to or lower than the Martensite phase temperature Mf of the shape memory alloy.
• the insulating performances of a heat shielding composite cloth can be remarkably improved while ensuring an adequate structural stiffness. It is thus possible to effectively employ the heat shielding composite cloth of the invention for the manufacturing of garments such as gauntlets for workers operating on high temperature pipes or fire fighter vests.
• the ratio (Lu+Ll)/H is preferably comprised between 0.6 and 4, and the ratio between Lu/Ll is preferably comprised between 0.5 and 2.
• Figure 1 is a schematic cross-sectional view of a portion of a heat shielding composite cloth according to an embodiment of the present invention, showing the composite cloth in an operating condition wherein the SMA wires are at a temperature above the Austenite temperature Af of the shape memory alloy of which they are made,
• Figure 2 is a schematic cross-sectional view of a portion of a heat shielding composite cloth according to an alternative embodiment of the present invention
• Figure 3 is a schematic cross-sectional view of a portion of a heat shielding composite cloth according to a further embodiment of the present invention.
• Figures 4-6 are schematic cross-sectional detail views showing possible ways to restrain a SMA wire to the upper and lower layers of the heat shielding composite cloth of the present invention
• Figures 7-9 show schematic partially broken top views of three different embodiments of the composite cloth according to the present invention.
• the size of some components of the composite cloth such as, for example, the diameter of the shape memory alloy wires and the thickness of the upper layer and of the lower layer of the heat shielding cloth, has been altered in some cases so as to ease understanding of the invention.
• the inventors have found that in order to improve a heat shielding composite cloth it is of the utmost importance to have a wide contact between the shape memory alloy (SMA) wires and the upper and lower layers, respectively, that are spaced away from each other when the SMA wires are heated from the Martensite phase temperature Mf of the shape memory alloy of which they are made, up to or above the Austenite phase temperature Af thereof, i.e. the actuation temperature.
• SMA shape memory alloy
• a wide (long) contact between the shape memory alloy (SMA) wires and the upper and lower layers allows to avoid formation of localized stress points that may tear or break the layers, as well as to prevent SMA wires from being disengaged from them as a consequence of possible torn or broken portions. Tilting movements of the SMA wires of the composite cloth may also be effectively prevented.
• SMA shape memory alloy
• a wide contact allows to distribute homogeneously the stresses that are generated upon heating, i.e. during an actuation cycle of the SMA wires, as well as to improve stability of the composite cloth during subsequent actuation cycles of the SMA wires.
• the overall performance of a garment employing a heat shielding composite cloth according to the invention is therefore more reliable and consistent over time than that of a prior art heat shielding composite cloth.
• the increase in the distance between the two layers of the composite cloth improves its thermal shielding ability. For this reason, it is important to define the minimal distance between the two layers of the cloth as those points/regions thereof having the highest thermal conductivity.
• the minimal distance characterizes the configuration of the composite cloth when the SMA wires are not actuated, i.e. when they are at a temperature lower than the
• Martensite phase temperature Mf Martensite phase temperature Mf.
• the layers of the composite cloth contact each other at least at some points or areas. It will be appreciated that in the regions where the shape memory alloy wires are arranged the two layers are slightly separated from each other, the gap size depending on the wire diameter.
• the SMA wires When the composite cloth is actuated, i.e. when its temperature reaches the Austenite phase temperature Af or is higher than that, the SMA wires cause the layers to be spaced away from each other. In such a configuration the layers are substantially parallel to each other.
• the overall configuration of the heat shielding composite cloth 100, 110, 120 is such that at a temperature equal to or above the Austenite phase temperature Af the distance between the upper and lower layers 11, 12 starting from a minimal distance comprised between 0 and 5 mm is increased by an amount comprised between 1 and 40 mm.
• FIG. 1 showing three embodiments of the composite cloth of the invention in an actuated configuration, i.e. at a temperature equal to or above the Austenite phase temperature Af.
• the layers 11, 12 are substantially parallel to each other.
• the wording "substantially parallel” encompasses possible slight variations of the relative distance between the layers due to e.g. manufacturing tolerances and boundary conditions, in particular close to the seams of a real product such as a gauntlet or a fire fighter vest.
• Figure 1 shows a schematic cross-sectional view of a composite cloth portion 100 having a lower layer 11 an upper layer 12 and at least one shape memory alloy wire 103 disposed between them.
• the layers 11, 12 are movably connected to each other by the shape memory alloy wire 103, as it will be explained in greater detail in the following.
• the shape memory alloy wire 103 is shown in its fully actuated configuration, i.e. when the temperature of the composite cloth is equal to or higher than the Austenite phase temperature Af of the shape memory alloy of which the SMA wire is made.
• the portions of the shape memory alloy wire 103 that are restrained to the lower layer 11 have respective lengths Lll, L12, ... , Lin
• the portions of the shape memory alloy wire 103 that are restrained to the upper layer 12 have respective lengths Lul, Lu2, Lun
• the portions of the shape memory alloy wire 103 that are arranged between the lower layer 11 and the upper layer 12 have respective lengths HI, H2, ... , Hn.
• LI is the sum of all the lengths Lll, L12, ... , Lin
• Lu is the sum of all the lengths Lul, Lu2, ... , Lun
• H is the sum of the lengths HI, H2, ... , Hn all sums being referred to a same area of 3 cm 2 of the composite cloth.
• Figures 2 and figure 3 respectively show schematic cross-sectional views of composite cloths 110 and 120, where the shape memory alloy wires 113, 123 have different actuated shapes.
• Figures 1-3 show the most preferred shapes for an actuated shape memory alloy wire incorporated in a composite cloth according to the present invention.
• Figures 4-6 are detail views schematically showing different ways to restrain a shape memory alloy wire 103 to the lower and upper layers 11, 12 of the composite cloth of the invention. It is to be remarked that the present invention is not limited to any specific way to restrain the shape memory alloy wires 103, 113, 123 to the upper and lower layers 11 and 12, even though the ones depicted in figure 4-6 are the most preferred ones, more specifically:
• the composite cloth does not contain any shape memory alloy wires, e.g. at boundary seams, so it is considered encompassed in the present invention a composite cloth fulfilling the above relationships in any of its units of area.
• the present invention is not limited to a specific number of wires arranged between the upper and lower layers 11 and 12, even though it is preferred that the number of wires 103, 113, 123 is comprised between 1 and 200 over a square area B of 10 cm 2 .
• These embodiments are schematically shown in the partially broken top views of figures 7 and 8.
• the shape memory alloy wires 103 are disposed according to a parallel pattern, see element 70 of figure 7, or according to a grid-like pattern with 90° angles between crossing wires, see element 80 in figure 8. It is to be underlined that also other wires crossing dispositions, although less preferred, are possible, with intersecting wires not being perpendicular to each other.
• the composite cloth 70 shown in figure 7 contains eleven parallel shape memory alloy wires 103 in the area of square B of 10 cm 2
• the composite cloth 80 shown in figure 8 contains eight shape memory alloy wires (5 vertical, 3 horizontal) in the area of square B of 10 cm 2 .
• the preferred shape memory alloy wire diameter is comprised between 50 and 250 ⁇ .
• the shape memory alloy wires are real objects, departures from a circular section are possible, so the term diameter is to be intended as the diameter of the smallest enclosing circle.
• the shape memory alloys preferably have a Martensite phase temperature Mf equal to or lower than 40°C and an Austenite phase temperature Af equal to or higher than 60°C.
• Suitable alloys having such temperatures are Ni-Ti based alloys such as Nitinol, with or without additional elements, such as Hf, Nb, Pt, Cu.
• additional elements such as Hf, Nb, Pt, Cu.
• the proper choice of alloy and its characteristics are known to those skilled in the art, see for example:
• a plurality of different shape memory alloy wires may be used to movably connect the upper layer and the lower layer to one another.
• the SMA wires may have different diameters and/or alloy composition (with different Mf, Af temperatures).
• the term “different diameters” for the SMA wires means that a SMA wire has a diameter that is at least ⁇ 10% with respect to another SMA wire, taking into account the standard wires diameter tolerance, while “different Mf, Af temperatures” means that the different types of SMA wires have at least ⁇ 10°C, preferably ⁇ 20°C, in Mf and/or Af to exploit the differential thermal actuation.
• the present invention is not limited to any type of thermal insulating material for the composite cloth layers.
• Such materials may comprise glass-wool fibers, jute, aramid fibers, viscous rayon, any light flame retardant material, and their combinations.
• a further layer made of a thermal insulating material may be provided over one or both of the composite cloth layers on the external side thereof.
• the composite cloth 90 may comprise metallic wires 104 whose function is to increase its structural resistance.
• the metallic wires 104 may be e.g. shape memory alloy wires.
• Figure 9 shows metallic wires 104 that are parallel to each other and perpendicular to the SMA wires 103, but the present invention is not limited to such a pattern nor to any specific wire arrangement.
• a thermally insulating gas may be arranged between the upper and lower layers.
• a thermally insulating solid material is instead added between the upper and lower layers, such material shall be lightweight to avoid discomfort to the user, and for example may comprise glass- wool fibers, aramid fibers, viscous rayon, any light flame retardant material, jute and their combinations.
• the minimal distance between the lower layer and the upper layer is achieved when the temperature is below or at the Martensite phase temperature Mf, and is determined by the arrangement of the SMA wires and by the thickness of the additional material, while the distance between the lower layer and the upper layer in the actuated configuration, i.e. above the Austenite phase temperature Af, is determined by the actuation of the shape memory alloy wires.
• a plurality of composite cloths according to the present invention combined together, for example superimposed to each other by joining together the upper layer of a composite cloth with the lower layer of another composite cloth, or alternatively by using a same layer as the upper layer of one composite cloth and as the lower layer of an adjacent composite cloth.
• Composite cloths that need to be actuated/de-actuated at different temperatures i.e. that employ shape memory alloy wires made of alloys having different Mf and Af temperatures, may thus be manufactured.
• the invention in a second aspect thereof, relates to garments made with or incorporating one or more composite cloths according to the present invention. Gauntlets and fire fighters vests are among the most useful applications of the invention.
• Example 1 (specimen preparation)
• Sample SI and comparative samples CI and C2 have been heated in order actuate the SMA wires to achieve the improved heath shielding function by means of layer separation, the heating was made through an electric heating plate, previously stabilized to 300°C temperature, positioned in contact with the lower layer of the sample.
• comparative sample CI is an approximate representation on the expected behavior of a cloth made according to the afore-mentioned international patent application WO 99/005926.

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• Health & Medical Sciences (AREA)
• Textile Engineering (AREA)
• Engineering & Computer Science (AREA)
• Business, Economics & Management (AREA)
• Emergency Management (AREA)
• General Health & Medical Sciences (AREA)
• Toxicology (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Woven Fabrics (AREA)
• Laminated Bodies (AREA)
• Professional, Industrial, Or Sporting Protective Garments (AREA)
• Gloves (AREA)

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• 2017
  • 2017-07-19 IT IT102017000082051A patent/IT201700082051A1/it unknown
• 2018
  • 2018-07-17 CN CN201880046910.XA patent/CN110914049B/zh active Active
  • 2018-07-17 JP JP2019571595A patent/JP7062701B2/ja active Active
  • 2018-07-17 WO PCT/IB2018/055273 patent/WO2019016689A2/en not_active Ceased
  • 2018-07-17 US US16/611,562 patent/US10773487B2/en active Active
  • 2018-07-17 EP EP18750508.6A patent/EP3599919B1/en active Active

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