Patents by Inventor Arnaud Allais
Arnaud Allais has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20110312500Abstract: Method of depositing a buffer layer of epitaxial metal oxide on a functionalised surface of a textured metal substrate, said method comprising the following steps: (1) a layer is deposited of a precursor of an oxide of the type A2?xB2+xO7 where A represents a metal of valency 3 or a mixture of several of these metals, and B a metal of valency 4, and x is a number between ?0.1 and +0.1, from a solution of carboxylates of said metals A and B, (2) said layer of oxide precursor is left to dry, (3) heat treatment is carried out in order to pyrolyse said oxide precursor and to form the oxide, at least part of said heat treatment being carried out under a flow of reducing gas.Type: ApplicationFiled: December 18, 2009Publication date: December 22, 2011Applicant: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUEInventors: Philippe Odier, Stéphanie Morlens, Cyril Millon, Tristan Caroff, Carmen Jimenez, Jean-Louis Soubetroux, Arnaud Allais, Mark Rikel
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Patent number: 7979976Abstract: A method for arranging a superconductor cable including the step of laying the superconductive cable core into a cryostat with an overlength in comparison to the axial length of said cryostat. After laying the superconductive cable core, it is cooled to its operating temperature thereby shortening the superconductive cable core relative to the cryostat. After cooling the superconductive cable core, the shortened superconductive cable core is mechanically fixed at its two ends to the ends of the cryostat. After fixing the shortened superconductive cable core, terminations are mounted on the ends of the cable core, such that if the superconductive cable core heats up, the core deforms into a wave or helix inside the cryostat, with the length change that acts on components of the superconductor cable being negligible.Type: GrantFiled: January 23, 2007Date of Patent: July 19, 2011Assignee: NexansInventors: Rainer Soika, Arnaud Allais
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Publication number: 20100275437Abstract: A method for laying a superconductor cable having a superconductive cable core and a cryostat enclosing the superconductive cable core, with the superconductive cable core being arranged freely mobile in the cryostat. The method includes cooling the superconductive cable core to the operating temperature after laying the superconductor cable, shortening the superconductive cable core relative to the cryostat, fixing the superconductive cable core at its ends; and mounting terminations on the ends of the cable core.Type: ApplicationFiled: November 2, 2009Publication date: November 4, 2010Inventors: Rainer Soika, Arnaud Allais
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Patent number: 7825331Abstract: An electrical bushing (1) for connecting a superconducting device to a device located at ambient temperature, the bushing (1) having an electrical conductor (9) and an insulating layer (10) surrounding the electrical conductor (9). An interlayer (15) is provided between the electrical conductor (9) and the insulating layer (10) and makes it possible for the electrical conductor (9) to slide in the insulating layer (10) within a temperature range of from 70 kelvin to the ambient temperature. A field control layer (11) is also applied to the insulating layer (10).Type: GrantFiled: November 13, 2006Date of Patent: November 2, 2010Inventors: Arnaud Allais, Pierre Mirebeau
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Patent number: 7737086Abstract: A method is provided for producing a superconductive electrical conductor (7) in which a layer of an yttrium-barium-copper oxide (YBCO) is applied as a superconductive material onto a textured metal base directly or after prior application of a buffer layer, and is subjected to a heat treatment. To this end an interlayer of a metallic material which is compatible with the crystal structure of YBCO, or with the structure of a buffer layer suitable for the application of YBCO, is initially applied all around onto an elongate metal support (1). The support (1) provided with the interlayer is subsequently processed so that predetermined texturing is imparted to the interlayer as a metal base for the layer of YBCO material or for the buffer layer. The layer of superconductive YBCO material is then applied all around, directly onto the textured interlayer or onto the buffer layer previously applied thereon, and the heat treatment is finally carried out.Type: GrantFiled: October 23, 2007Date of Patent: June 15, 2010Assignee: NexansInventors: Arnaud Allais, Nat Dirk Isfort
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Patent number: 7709742Abstract: A superconductor cable is described, having a superconductive flexible cable core (1) , which is laid in a cryostat (2, 3, 4), in which the cable core (1) runs in the cryostat (2, 3, 4) in the form of a wave or helix at room temperature.Type: GrantFiled: March 17, 2006Date of Patent: May 4, 2010Assignee: NexansInventors: Arnaud Allais, Frank Schmidt, Erik Marzahn
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Patent number: 7633014Abstract: A superconductor cable includes a superconductive cable core (1) and a cryostat (2) enclosing the same. The cable core (1) has a superconductive conductor (3), an insulation (4) surrounding the same and a shielding (5) surrounding the insulation (4). A layer (3b) of a dielectric or semiconducting material is applied to a central element (3a) formed from a normally conducting material as a strand or tube and a layer (3c) of at least one wire or strip of superconductive material is placed helically on top. The central element (3a) and the layer (3c) are connected to each other in an electrically conducting manner at the ends of the cable core (1).Type: GrantFiled: March 17, 2006Date of Patent: December 15, 2009Assignee: NexansInventors: Arnaud Allais, Frank Schmidt
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Patent number: 7622425Abstract: A method is provided for producing a superconductive electrical conductor, in which a layer of an yttrium-barium-copper oxide (YBCO) is applied as a superconductive material onto a textured metal substrate, and is subjected to a heat treatment. In order to produce a wire-shaped conductor, a textured metal substrate, provided as a strip (2), is initially shaped in its longitudinal direction around an elongate metal support (1) with a circular cross section to form a slotted tube (3) having edges extending in the longitudinal direction and adjoining one another at a slot (4). The slotted tube (3) is next closed by welding the slot (4) shut, and the closed tube (9) is then contracted by pulling until it bears on the support (1). The layer (12) of superconductive YBCO material is thereupon applied all around, and the heat treatment is finally carried out.Type: GrantFiled: October 23, 2007Date of Patent: November 24, 2009Assignee: NexansInventors: Arnaud Allais, Dirk Isfort, Claus-Friedrich Theune, Klaus Porcher
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Patent number: 7605329Abstract: A terminal structure (2) for a superconducting cable (1) is described. It consists of a conductor (2a) and an insulator (2b) that surrounds the conductor (2a), wherein the superconducting cable (1) has a core with a superconducting conductor (5) and a layer of insulation that surrounds the conductor (5), and wherein the core is arranged in such a way that it can move longitudinally in a cryostat. The conductor (2a) of the terminal structure (2) is electrically connected with the superconducting conductor (5) or with a normal conductor (6) that is connected with the superconducting conductor (5) by means of a tubular part (7) made of an electrically conductive material, wherein the superconducting conductor (5) or the normal conductor (6) can slide in the part (7) in the direction of the superconductor.Type: GrantFiled: June 9, 2005Date of Patent: October 20, 2009Assignee: NexansInventors: Frank Schmidt, Arnaud Allais, Pierre Mirebeau, Francois Ganhungu, Nicolas Lallouet
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Publication number: 20090170709Abstract: A method is provided for producing a superconductive electrical conductor, in which a layer of an yttrium-barium-copper oxide (YBCO) is applied as a superconductive material onto a textured metal substrate, and is subjected to a heat treatment. In order to produce a wire-shaped conductor, a textured metal substrate, provided as a strip (2), is initially shaped in its longitudinal direction around an elongate metal support (1) with a circular cross section to form a slotted tube (3) having edges extending in the longitudinal direction and adjoining one another at a slot (4). The slotted tube (3) is next closed by welding the slot (4) shut, and the closed tube (9) is then contracted by pulling until it bears on the support (1). The layer (12) of superconductive YBCO material is thereupon applied all around, and the heat treatment is finally carried out.Type: ApplicationFiled: October 23, 2007Publication date: July 2, 2009Inventors: Arnaud Allais, Dirk Isfort, Claus-Friedrich Theune, Klaus Porcher
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Publication number: 20090069188Abstract: A superconductive electrical cable is provided, which comprises a conductor consisting of superconductive wires. The conductor (L) is designed as a stranded conductor in which the wires (1) are stranded together with a predetermined pitch length (S) lying between about 5×D and about 20×D, where D is the diameter of the stranded conductor.Type: ApplicationFiled: June 26, 2008Publication date: March 12, 2009Inventors: Arnaud Allais, Frank Schmidt
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Patent number: 7456362Abstract: An electrical bushing (1) for connecting a superconducting device (2) to a device located at room temperature has an electrical conductor (9) and an insulating layer (10) surrounding the conductor (9). The conductor (9) has a plurality of tubular sections (9a, 9b, 9c), which are made from an electrically conductive material and are electrically connected to one another at their ends, and the tubular sections (9a, 9b, 9c) having an identical outer diameter D and inner diameters d which are different from one another.Type: GrantFiled: September 7, 2006Date of Patent: November 25, 2008Assignee: NexansInventors: Arnaud Allais, Georg Balog, Nicolas Lallouet
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Publication number: 20080119365Abstract: A method is provided for producing a superconductive electrical conductor (7) in which a layer of an yttrium-barium-copper oxide (YBCO) is applied as a superconductive material onto a textured metal base directly or after prior application of a buffer layer, and is subjected to a heat treatment. To this end an interlayer of a metallic material which is compatible with the crystal structure of YBCO, or with the structure of a buffer layer suitable for the application of YBCO, is initially applied all around onto an elongate metal support (1). The support (1) provided with the interlayer is subsequently processed so that predetermined texturing is imparted to the interlayer as a metal base for the layer of YBCO material or for the buffer layer. The layer of superconductive YBCO material is then applied all around, directly onto the textured interlayer or onto the buffer layer previously applied thereon, and the heat treatment is finally carried out.Type: ApplicationFiled: October 23, 2007Publication date: May 22, 2008Inventors: Arnaud Allais, Nat Dirk Isfort
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Publication number: 20080083546Abstract: A superconductive cable includes a superconductive conductor (2), a dielectric (3) enclosing the latter and a superconductive screen (4) arranged over the dielectric acting as a spacer. The cable is enclosed with the inclusion of an air gap by a cryostat (7) which consists of a metal inner tube (8), a metal outer tube (9) and superinsulation (10) arranged between them. An intermediate metal tube (5), which is closed all around over its entire length, is arranged over the screen (4) while leaving a gap (6) from the cryostat (7). A medium which is fluid at room temperature, and to which a constant pressure is applied, is introduced as an impregnating medium for the dielectric (3) into the space between the conductor (2) and the intermediate tube (5), and at least one refrigeration unit for supplying a liquid refrigerant is connected to the gap (6) between the cryostat (7) and the intermediate tube (5).Type: ApplicationFiled: May 10, 2007Publication date: April 10, 2008Inventors: Arnaud Allais, Frank Schmidt
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Patent number: 7325840Abstract: Arrangement for connecting a fiber-reinforced plastic pipe (18) to a stainless steel flange (12, 16), in which the end of the fiber-reinforced plastic pipe (18) is accommodated in a ring-shaped groove (12a, 16a) in the flange (12, 16), the groove conforming to the dimensions of the fiber-reinforced plastic pipe (18), where the gap remaining between the end of the fiber-reinforced plastic pipe (18) and the ring-shaped groove (12a, 16a) is filled with a sealant (19).Type: GrantFiled: May 18, 2005Date of Patent: February 5, 2008Inventors: Arnaud Allais, Ernst Hoffmann
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Patent number: 7304826Abstract: A method and system for providing protection for a superconducting electrical cable located in a utility power network includes detecting a fault current on the superconducting electric cable, determining the cumulative total energy dissipated in the superconducting electrical cable from the fault current and at least one prior fault current over a predetermined time period, and determining whether to disconnect the superconducting electrical cable from the utility power network on the basis of the cumulative total energy dissipated.Type: GrantFiled: July 21, 2006Date of Patent: December 4, 2007Assignees: American Superconductor Corporation, NexansInventors: Jie Yuan, James F. MaGuire, Arnaud Allais, Frank Schmidt
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Publication number: 20070235211Abstract: A method for laying a superconductor cable having a superconductive cable core and a cryostat enclosing the superconductive cable core, with the superconductive cable core being arranged freely mobile in the cryostat. The method includes cooling the superconductive cable core to the operating temperature after laying the superconductor cable, shortening the superconductive cable core relative to the cryostat, fixing the superconductive cable core at its ends; and mounting terminations on the ends of the cable core.Type: ApplicationFiled: January 23, 2007Publication date: October 11, 2007Inventors: Rainer Soika, Arnaud Allais
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Publication number: 20070181324Abstract: An electrical bushing (1) for connecting a superconducting device to a device located at ambient temperature, the bushing (1) having an electrical conductor (9) and an insulating layer (10) surrounding the electrical conductor (9). An interlayer (15) is provided between the electrical conductor (9) and the insulating layer (10) and makes it possible for the electrical conductor (9) to slide in the insulating layer (10) within a temperature range of from 70 kelvin to the ambient temperature. A field control layer (11) is also applied to the insulating layer (10).Type: ApplicationFiled: November 13, 2006Publication date: August 9, 2007Inventors: Arnaud Allais, Pierre Mirebeau
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Publication number: 20070131450Abstract: An electrical bushing (1) for connecting a superconducting device (2) to a device located at room temperature has an electrical conductor (9) and an insulating layer (10) surrounding the conductor (9). The conductor (9) has a plurality of tubular sections (9a, 9b, 9c), which are made from an electrically conductive material and are electrically connected to one another at their ends, and the tubular sections (9a, 9b, 9c) having an identical outer diameter D and inner diameters d which are different from one another.Type: ApplicationFiled: September 7, 2006Publication date: June 14, 2007Inventors: Arnaud Allais, Georg Balog, Nicolas Lallouet
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Publication number: 20070093977Abstract: A method and system for providing protection for a superconducting electrical cable located in a utility power network includes detecting a fault current on the superconducting electric cable, determining the cumulative total energy dissipated in the superconducting electrical cable from the fault current and at least one prior fault current over a predetermined time period, and determining whether to disconnect the superconducting electrical cable from the utility power network on the basis of the cumulative total energy dissipated.Type: ApplicationFiled: July 21, 2006Publication date: April 26, 2007Inventors: Jie Yuan, James MaGuire, Arnaud Allais, Frank Schmidt