Patents by Inventor Tetsuyuki Kaneko
Tetsuyuki Kaneko 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: 8565845Abstract: The invention offers a superconducting coil that has the shape of a pancake formed by winding a superconducting conductor. The superconducting conductor is composed of a tape-shaped (Bi, Pb)2223-based superconducting wire and a tape-shaped thin-film RE123-based superconducting wire that are electrically connected in parallel with each other. The coil generates only a low voltage in the steady-operation state, limits the generated voltage to a low level even in a state where an external disturbance enters for some reason, and is therefore less susceptible to quenching. Consequently, the coil can be operated stably in both states. The invention also offers a superconducting conductor to be used to form the coil.Type: GrantFiled: February 6, 2008Date of Patent: October 22, 2013Assignee: Sumitomo Electric Industries, Ltd.Inventors: Shinichi Kobayashi, Tetsuyuki Kaneko
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Publication number: 20090093370Abstract: The invention offers a superconducting coil that has the shape of a pancake formed by winding a superconducting conductor. The superconducting conductor is composed of a tape-shaped (Bi, Pb)2223-based superconducting wire and a tape-shaped thin-film RE123-based superconducting wire that are electrically connected in parallel with each other. The coil generates only a low voltage in the steady-operation state, limits the generated voltage to a low level even in a state where an external disturbance enters for some reason, and is therefore less susceptible to quenching. Consequently, the coil can be operated stably in both states. The invention also offers a superconducting conductor to be used to form the coil.Type: ApplicationFiled: February 6, 2008Publication date: April 9, 2009Applicant: Sumitomo Electric Industries, Ltd.Inventors: Shinichi Kobayashi, Tetsuyuki Kaneko
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Patent number: 6777376Abstract: In order to provide a superconducting wire that has a high critical current value, has no defects such as bulges, and has high mechanical strength, an oxide superconducting material (1) is covered, and ceramic particles or fibers (3) are buried in the surface of a covering (2) made of metalType: GrantFiled: October 10, 2000Date of Patent: August 17, 2004Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tetsuyuki Kaneko, Munetsugu Ueyama, Akira Mikumo, Naoki Ayai, Shin-ichi Kobayasi
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Patent number: 6713437Abstract: The method of preparing an oxide superconducting wire comprises steps of preparing a wire by coating raw material powder for a Bi—Pb—Sr—Ca—Cu—O based oxide superconductor including a 2223 phase with a metal and heat treating the wire in a pressurized atmosphere containing oxygen in a prescribed partial pressure, and the total pressure of the pressurized atmosphere is at least 0.5 MPa. The pressure heat treatment apparatus comprises a pressure furnace storing and heat treating a target in a pressurized atmosphere, a pressure regulator for measuring the total pressure in the pressure furnace, an oxygen concentration meter for measuring the oxygen concentration in the pressure furnace and a controller for controlling the oxygen partial pressure in the pressure furnace in response to the total pressure measured by the pressure regulator and the oxygen concentration measured by the oxygen concentration meter.Type: GrantFiled: October 25, 2002Date of Patent: March 30, 2004Assignee: Sumitomo Electric Industries, Ltd.Inventors: Shinichi Kobayashi, Tetsuyuki Kaneko, Ryosuke Hata
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Patent number: 6642182Abstract: The present invention provides an oxide superconducting wire including a component provided in the form of a tape and a metal tape. The component in the form of a tape has an oxide superconducting member and a metal coating member formed mainly of silver and coating a surface of the oxide superconducting member. The metal tape, bonded in a heat treatment (e.g., fusion- or diffusion-bonded) to a surface of the component in the form of a tape, does not contain any superconducting material and it is formed mainly of silver and it also contains at least one component other than silver.Type: GrantFiled: September 26, 2002Date of Patent: November 4, 2003Assignee: Sumitomo Electric Industries, Ltd.Inventor: Tetsuyuki Kaneko
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Patent number: 6632776Abstract: The method of preparing an oxide superconducting wire comprises steps of preparing a wire by coating raw material powder for a Bi—Pb—Sr—Ca—Cu—O based oxide superconductor including a 2223 phase with a metal and heat treating the wire in a pressurized atmosphere containing oxygen in a prescribed partial pressure, and the total pressure of the pressurized atmosphere is at least 0.5 MPa. The pressure heat treatment apparatus comprises a pressure furnace storing and heat treating a target in a pressurized atmosphere, a pressure regulator for measuring the total pressure in the pressure furnace, an oxygen concentration meter for measuring the oxygen concentration in the pressure furnace and a controller for controlling the oxygen partial pressure in the pressure furnace in response to the total pressure measured by the pressure regulator and the oxygen concentration measured by the oxygen concentration meter.Type: GrantFiled: July 13, 2001Date of Patent: October 14, 2003Assignee: Sumitomo Electric Industries Ltd.Inventors: Shinichi Kobayashi, Tetsuyuki Kaneko, Ryosuke Hata
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Patent number: 6546614Abstract: The diameter of a first metal tube charged with raw material powder is reduced for obtaining an elementary wire. A plurality of such elementary wires are charged into a second metal tube, which in turn is reduced in diameter for obtaining a round first wire having a plurality of first filaments. The first wire is uniaxially compressed thereby obtaining a tape-like second wire having a plurality of second filaments. The second wire is heat treated thereby obtaining an oxide superconducting wire including a plurality of superconductor filaments. The maximum grain size of the raw material powder is smaller than the minor diameter of the first or second filaments.Type: GrantFiled: August 3, 2001Date of Patent: April 15, 2003Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tetsuyuki Kaneko, Naoki Ayai, Jun Fujikami, Shinichi Kobayashi
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Publication number: 20030059734Abstract: The method of preparing an oxide superconducting wire comprises steps of preparing a wire by coating raw material powder for a Bi—Pb—Sr—Ca—Cu—O based oxide superconductor including a 2223 phase with a metal and heat treating the wire in a pressurized atmosphere containing oxygen in a prescribed partial pressure, and the total pressure of the pressurized atmosphere is at least 0.5 MPa. The pressure heat treatment apparatus comprises a pressure furnace storing and heat treating a target in a pressurized atmosphere, a pressure regulator for measuring the total pressure in the pressure furnace, an oxygen concentration meter for measuring the oxygen concentration in the pressure furnace and a controller for controlling the oxygen partial pressure in the pressure furnace in response to the total pressure measured by the pressure regulator and the oxygen concentration measured by the oxygen concentration meter.Type: ApplicationFiled: October 25, 2002Publication date: March 27, 2003Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Shinichi Kobayashi, Tetsuyuki Kaneko, Ryosuke Hata
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Publication number: 20030029906Abstract: The present invention provides an oxide superconducting wire including a component provided in the form of a tape and a metal tape. The component in the form of a tape has an oxide superconducting member and a metal coating member formed mainly of silver and coating a surface of the oxide superconducting member. The metal tape, bonded in a heat treatment (e.g., fusion- or diffusion-bonded) to a surface of the component in the form of a tape, does not contain any superconducting material and it is formed mainly of silver and it also contains at least one component other than silver.Type: ApplicationFiled: September 26, 2002Publication date: February 13, 2003Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventor: Tetsuyuki Kaneko
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Patent number: 6507746Abstract: The present invention provides an oxide superconducting wire including a component provided in the form of a tape and a metal tape. The component in the form of a tape has an oxide superconducting member and a metal coating member formed mainly of silver and coating a surface of the oxide superconducting member. The metal tape, bonded in a heat treatment (e.g., fusion- or diffusion-bonded) to a surface of the component in the form of a tape, does not contain any superconducting material and it is formed mainly of silver and it also contains at least one component other than silver.Type: GrantFiled: February 21, 2001Date of Patent: January 14, 2003Assignee: Sumitomo Electric Industries, Ltd.Inventor: Tetsuyuki Kaneko
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Patent number: 6498302Abstract: A multifilamentary oxide superconducting wire having a low aspect ratio and a relatively high critical current density, and being suitable for a stranded wire. In order to produce such a wire, a tape-shaped, multifilamentary oxide superconducting wire prepared by the powder-in-tube process is cut along its length. The resulting multifilamentary oxide superconducting wires have a width smaller than that of the tape-shaped wire. The resulting wires typically have an aspect ratio of one to two. The filaments of the resulting wires are in the shape of a ribbon extending in the longitudinal direction, and arranged substantially parallel to each other and in layers. The filaments have an aspect ratio greater than two. The filaments inside include a filament having a portion substantially not covered with the stabilizer.Type: GrantFiled: March 30, 2001Date of Patent: December 24, 2002Assignee: Sumitomo Electric Industries, Ltd.Inventor: Tetsuyuki Kaneko
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Patent number: 6493925Abstract: Powder including at least a superconducting phase is degassed (step S1). After the powder is filled in a silver pipe (step S2), the silver pipe is degassed at a high temperature (step S3). After a plurality of single-core wires are inserted into another silver pipe to attain a multi-core structure, the silver pipe is degassed at a high temperature (step S5). The silver pipe is sealed under a reduced pressure (step S6). Therefore, even when a multi-core superconducting wire is manufactured, a manufacturing method of a superconducting wire capable of preventing swelling of the wire caused by a residual gaseous component can be obtained.Type: GrantFiled: September 19, 2000Date of Patent: December 17, 2002Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tetsuyuki Kaneko, Munetsugu Ueyama, Akira Mikumo, Naoki Ayai, Shin-ichi Kobayashi
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Publication number: 20020043298Abstract: The diameter of a first metal tube charged with raw material powder is reduced for obtaining an elementary wire. A plurality of such elementary wires are charged into a second metal tube, which in turn is reduced in diameter for obtaining a round first wire having a plurality of first filaments. The first wire is uniaxially compressed thereby obtaining a tape-like second wire having a plurality of second filaments. The second wire is heat treated thereby obtaining an oxide superconducting wire including a plurality of superconductor filaments. The maximum grain size of the raw material powder is smaller than the minor diameter of the first or second filaments.Type: ApplicationFiled: August 3, 2001Publication date: April 18, 2002Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Tetsuyuki Kaneko, Naoki Ayai, Jun Fujikami, Shinichi Kobayashi
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Publication number: 20020022576Abstract: The method of preparing an oxide superconducting wire comprises steps of preparing a wire by coating raw material powder for a Bi—Pb—Sr—Ca—Cu—O based oxide superconductor including a 2223 phase with a metal and heat treating the wire in a pressurized atmosphere containing oxygen in a prescribed partial pressure, and the total pressure of the pressurized atmosphere is at least 0.5 MPa. The pressure heat treatment apparatus comprises a pressure furnace storing and heat treating a target in a pressurized atmosphere, a pressure regulator for measuring the total pressure in the pressure furnace, an oxygen concentration meter for measuring the oxygen concentration in the pressure furnace and a controller for controlling the oxygen partial pressure in the pressure furnace in response to the total pressure measured by the pressure regulator and the oxygen concentration measured by the oxygen concentration meter.Type: ApplicationFiled: July 13, 2001Publication date: February 21, 2002Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Shinichi Kobayashi, Tetsuyuki Kaneko, Ryosuke Hata
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Publication number: 20010044385Abstract: A multifilamentary oxide superconducting wire having a low aspect ratio and a relatively high critical current density, and being suitable for a stranded wire, is provided. In order to produce such a wire, a tape-shaped, multifilamentary oxide superconducting wire prepared by the powder-in-tube process is cut along its length. The resulting multifilamentary oxide superconducting wires have a width smaller than that of the tape-shaped wire. The resulting wires typically have an aspect ratio of one to two. The filaments of the resulting wires are in the shape of a ribbon extending in the longitudinal direction, and arranged substantially parallel to each other and in layers. The filaments have an aspect ratio greater than two. The filaments include a filament having a portion substantially not covered with the stabilizer.Type: ApplicationFiled: March 30, 2001Publication date: November 22, 2001Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD..Inventor: Tetsuyuki Kaneko
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Publication number: 20010021689Abstract: The present invention provides an oxide superconducting wire including a component provided in the form of a tape and a metal tape. The component in the form of a tape has an oxide superconducting member and a metal coating member formed mainly of silver and coating a surface of the oxide superconducting member. The metal tape, bonded in a heat treatment (e.g., fusion- or diffusion-bonded) to a surface of the component in the form of a tape, does not contain any superconducting material and it is formed mainly of silver and it also contains at least one component other than silver.Type: ApplicationFiled: February 21, 2001Publication date: September 13, 2001Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventor: Tetsuyuki Kaneko
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Patent number: 5936394Abstract: Method and apparatus of measuring a critical current value of a superconducting wire formed by wire sections S(n), n being 1.ltoreq.n.ltoreq.N and initially set to 1, comprising a first step (a) of determining electric currents I(m), m being 1.ltoreq.m.ltoreq.M; a second step (b) of setting m to 1; a third step (c) of passing the electric current I(m) through the wire section S(n); a fourth step (d) of detecting a voltage generated in the wire section S(n) by the electric current I(m); a fifth step (e) of replacing m with m+1; a sixth step (f) of repeating the steps (c) to (e) until m is equal to M; a seventh step (g) of replacing n with n+1; an eighth step (h) of repeating the steps (b)-(g) until n is equal to N, thereby obtaining N.times.Type: GrantFiled: February 24, 1998Date of Patent: August 10, 1999Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tetsuyuki Kaneko, Tetsuaki Sashida
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Patent number: 5840659Abstract: In order to provide a Tl--Ba--Ca--Cu--O superconductive material which can obtain a stable superconducting state and a method of preparing the same, the oxide superconductive material is expressed in the following composition formula:Tl.sub.x Ba.sub.2 Ca.sub.y Cu.sub.3 O.sub.zwhere x, y and z are in relations satisfying 1.5.ltoreq.x.ltoreq.2.0, 2.0.ltoreq.y.ltoreq.2.5, x+y=4.0 and 9.0.ltoreq.z.ltoreq.11.0, and comprises tetragonal system superconducting phases having lattice constants of a=0.385 to 0.386 nm and c longer than 3.575 nm, to exhibit zero resistance under a temperature of at least 125 K, while the method comprises a step of mixing powder raw materials in blending ratios for satisfying the above composition formula, a step of sintering the as-formed mixed powder in an oxygen jet or in the atmosphere to obtain a sintered body, and a step of annealing the sintered body in a closed atmosphere at 700.degree. to 800.degree. C. for at least 10 hours.Type: GrantFiled: March 14, 1997Date of Patent: November 24, 1998Assignees: Sumitomo Electric Industries, Ltd., Ube Industries Ltd., Matsushita Electrical Industrial Co., Ltd., International Superconductivity Technology CenterInventors: Tetsuyuki Kaneko, Kazuyuki Hamada, Hisao Yamauchi, Seiji Adachi, Shoji Tanaka