Patents by Inventor Gerard Duperray
Gerard Duperray 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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Patent number: 6542760Abstract: The invention relates a powder in tube type method of making an HTc superconductive multifilament strand having a silver-based matrix, in which: a first envelope is filled with powder reagents for an HTc superconductor; the resulting billet is drawn down into a monofilament strand; said monofilament strand is cut up into lengths and a secondary envelope is filled with the resulting lengths, thereby making a multifilament billet which is drawn down into a multifilament strand; said multifilament strand is cut up into lengths and a new envelope is filled with the resulting lengths, thereby making a new multifilament billet which is drawn down into a new multifilament strand; and it is shaped and subjected to heat treatment; according to the invention, at least one face of the monofilament strand is electrically insulated; and during the first multifilament step the secondary envelope is filled with the resulting insulated lengths.Type: GrantFiled: April 24, 2001Date of Patent: April 1, 2003Assignee: NexansInventors: Albert Leriche, Erick Beghin, Gérard Duperray, Denis Legat, Peter Friedrich Herrmann
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Patent number: 6442827Abstract: The invention relates to a powder in tube type method of manufacturing an HTc superconductor multifilament conductor having a matrix of compatible silver alloy and in which, during preparation of the multifilament billet, the number of segments per layer is organized so that, in cross-section, the segment layers viewed as a whole have the general shape of a converging-diverging nozzle, the throat of the converging-diverging nozzle shape being substantially contained in said superposition midplane; and in which, during the mechanical treatment of said multifilament billet preceding the synthesis heat treatment, a rolling force is applied in a direction perpendicular to the superposition midplane, and at least one of the side edges of the rolled billet is cut off perpendicularly to the superposition midplane, thereby revealing the matrix of compatible silver alloy.Type: GrantFiled: May 4, 2000Date of Patent: September 3, 2002Assignee: NexansInventors: Peter Friedrich Herrmann, Gérard Duperray, Albert Leriche, Jean-Pierre Tavergnier
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Patent number: 6344430Abstract: A powder in tube type method of making an HTc superconductive multifilament strand having a silver-based matrix, and an HTc superconductive multifilament strand having a silver-based matrix. The method includes, prior to the monofilament step, preparing a composite multilayer material is including at least one silver-based sheet, and at least one layer of non-superconductive ceramic material that is permeable to oxygen. During the monofilament step, a thickness of composite multilayer material is interposed between first and second thicknesses of silver-based material, thereby forming the first silver-based envelope.Type: GrantFiled: June 22, 2000Date of Patent: February 5, 2002Assignee: NexansInventors: Gérard Duperray, Fernard Grivon, Peter Friedrich Herrmann
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Publication number: 20010021690Abstract: The invention relates a powder in tube type method of making an HTc superconductive multifilament strand having a silver-based matrix, in which:Type: ApplicationFiled: April 24, 2001Publication date: September 13, 2001Inventors: Albert Leriche, Erick Beghin, Gerard Duperray, Denis Legat, Peter Friedrich Herrmann
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Patent number: 6272731Abstract: The invention relates a powder in tube type method of making an HTc superconductive multifilament strand having a silver-based matrix, in which: a first envelope is filled with powder reagents for an HTc superconductor; the resulting billet is drawn down into a monofilament strand; the monofilament strand is cut up into lengths and a secondary envelope is filled with the resulting lengths, thereby making a multifilament billet which is drawn down into a multifilament strand; the multifilament strand is cut up into lengths and a new envelope is filled with the resulting lengths, thereby making a new multifilament billet which is drawn down into a new multifilament strand; and it is shaped and subjected to heat treatment; according to the invention, at least one face of the monofilament strand is electrically insulated; and during the first multifilament step the secondary envelope is filled with the resulting insulated lengths.Type: GrantFiled: March 19, 1998Date of Patent: August 14, 2001Assignee: AlcatelInventors: Albert Leriche, Erick Beghin, Gérard Duperray, Denis Legat, Peter Friedrich Herrmann
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Patent number: 6110873Abstract: A powder in tube method of making an HTc superconductive multifilament strand having a silver-based matrix, in which method:prior to the monofilament step:a composite multilayer material is prepared comprising at least one silver-based sheet, and at least one layer of non-superconductive ceramic material that is permeable to oxygen; andduring the monofilament step, a thickness of composite multilayer material is interposed between first and second thicknesses of silver-based material, thereby forming said first silver-based envelope.Type: GrantFiled: March 27, 1998Date of Patent: August 29, 2000Assignee: AlcatelInventors: Gerard Duperray, Fernard Grivon, Peter Friedrich Herrmann
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Patent number: 6013608Abstract: A process for texturing an HTc superconductor of the matrix type based on silver and the superconductor material (Bi.sub.1-x Pb.sub.x).sub.2 Sr.sub.2 Ca.sub.y Cu.sub.1+y O.sub.6+2y where x.epsilon.[0; 0,4] and y.epsilon.{0, 1, 2} includes the following steps carried out in succession: raising the temperature of the superconductor from room temperature to the melting point of the superconductor material, maintaining the temperature of the superconductor constant at the melting point of the superconductor material for a relatively short period, varying the temperature of the superconductor between the melting point of the superconductor material and its synthesis temperature, maintaining the temperature of the superconductor constant at the synthesis temperature of the superconductor material for a relatively long period and reducing the temperature of the superconductor from the synthesis temperature of the superconductor material to room temperature.Type: GrantFiled: June 11, 1998Date of Patent: January 11, 2000Assignee: AlcatelInventors: Gerard Duperray, Peter Friedrich Herrmann, Denis Legat, Albert Leriche, Jean-Pierre Tavergnier
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Patent number: 5706571Abstract: A sheathed twisted superconductor with a high critical temperature is made from a billet obtained by assembling square cross-section single strands in a square cross-section metal tube. The multistrand obtained by drawing the billet through a roller die is twisted with a particular lay and rolled using rollers the diameter of which is much greater than the twist lay. The sheathed twisted superconductor obtained by this method is intended for variable current applications.Type: GrantFiled: September 13, 1996Date of Patent: January 13, 1998Assignee: Alcatel Alsthom Compagnie Generale D'ElectriciteInventors: Gerard Duperray, Erick Beghin, Denis Legat, Peter Friedrich Herrmann
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Patent number: 5594932Abstract: In a method for the manufacture of an encased high critical temperature superconducting wire by the "powder in tube" method, prior to the introduction of a compressed rod of superconducting material into a silver tube, the rod is heat treated so that grains of unwanted phase are reabsorbed. The tube can be drawn more easily, and strands can be produced with a regular geometry and no defects. The wire is constituted by 15 .mu.m to 20 .mu.m thick filaments (30) with a form factor of more than 60.Type: GrantFiled: June 9, 1994Date of Patent: January 14, 1997Assignee: Alcatel Alsthom Compagnie General d'ElectriciteInventors: Gerard Duperray, Denis Legat
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Patent number: 5206215Abstract: A process for obtaining precursors for high critical temperature superconductor ceramics by precipitating salts which are insoluble in water comprises the following stages: A starting solution of soluble salts is prepared in which the cations are in the stoichiometric proportions of the required superconductor phase. A first full precipitation is carried out of a first series of cations at a first value of pH. The first precipitates obtained is filtered out and washed and the filtrate is retained. The pH of the filtrate is changed to a second value and the residual cations are precipitated. The second precipitate is filtered. The first and second precipitates are homogenized. The product obtained is dried, calcined, and ground.Type: GrantFiled: March 13, 1992Date of Patent: April 27, 1993Assignee: Alcatel Alsthom Compagnie Generale d'ElectriciteInventors: Gerard Duperray, Francoise Ducatel
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Patent number: 5179075Abstract: A method of making at least one low electrical resistance connection between a metal and a high T.sub.c superconducting ceramic part, said part being made from a ceramic powder which is placed in a mold, compressed, and sintered, wherein at least one volume of silver or gold powder corresponding to the shape of said connection and situated at the desired location is placed inside said mold in juxtaposition with said ceramic powder but without being mixed therewith, after which the compression and the sintering are performed under an atmosphere containing oxygen and at a temperature that is lower than the melting temperature of silver or gold.Type: GrantFiled: October 29, 1990Date of Patent: January 12, 1993Assignee: GEC Alsthom SAInventors: Albert Leriche, Gerard Duperray, Fernand Grivon
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Patent number: 4569821Abstract: A porous metal body, e.g. an electrode for an electric cell, is prepared using the following steps:preparing a foam by adding a surface active agent and a gelling agent to water and then foaming the mixture by stirring and/or blowing air through it;incorporating metal powder in the foam in order to obtain a suspension of the metal therein;shaping the foam with its suspension of metal, and adding a stabilizing agent thereto, said stabilizing agent being one which polymerizes on contact with water, thereby causing the shaped foam to set in shape; andheating the set foam to pyrolize the organic material therein and to sinter the metal.This method produces a more even and a more reliable pore size than has previously been possible.Type: GrantFiled: February 18, 1983Date of Patent: February 11, 1986Assignee: Compagnie Generale d'Electricite, S.A.Inventors: Gerard Duperray, Michel Hilaire
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Patent number: 3971671Abstract: The energy converter utilizes the products of radiolysis of an aqueous solution of an oxidation-reduction pair and comprises a leak-tight jacket initially filled with a pure gas which is identical with the gas evolved as a result of radiolysis. A porous electrode impregnated with the aqueous solution of the oxidation-reduction pair and specific to the reaction of this latter is placed within the jacket. The converter also comprises a gas electrode which is specific to the gas evolved as a result of radiolysis, a porous diaphragm for effecting the ionic junction between the two electrodes by gas/liquid surface conductivity and means for connecting the electrodes to an external circuit.Type: GrantFiled: September 24, 1974Date of Patent: July 27, 1976Assignee: Commissariat a l'Energie AtomiqueInventors: Gerard Duperray, Charles Eyraud, Gerard Lecayon, Janine Lenoir