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).

  • Patent number: 8565845
    Abstract: 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: Grant
    Filed: February 6, 2008
    Date of Patent: October 22, 2013
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Shinichi Kobayashi, Tetsuyuki Kaneko
  • Publication number: 20090093370
    Abstract: 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: Application
    Filed: February 6, 2008
    Publication date: April 9, 2009
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Shinichi Kobayashi, Tetsuyuki Kaneko
  • Patent number: 6777376
    Abstract: 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 metal
    Type: Grant
    Filed: October 10, 2000
    Date of Patent: August 17, 2004
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Tetsuyuki Kaneko, Munetsugu Ueyama, Akira Mikumo, Naoki Ayai, Shin-ichi Kobayasi
  • Patent number: 6713437
    Abstract: 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: Grant
    Filed: October 25, 2002
    Date of Patent: March 30, 2004
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Shinichi Kobayashi, Tetsuyuki Kaneko, Ryosuke Hata
  • Patent number: 6642182
    Abstract: 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: Grant
    Filed: September 26, 2002
    Date of Patent: November 4, 2003
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Tetsuyuki Kaneko
  • Patent number: 6632776
    Abstract: 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: Grant
    Filed: July 13, 2001
    Date of Patent: October 14, 2003
    Assignee: Sumitomo Electric Industries Ltd.
    Inventors: Shinichi Kobayashi, Tetsuyuki Kaneko, Ryosuke Hata
  • Patent number: 6546614
    Abstract: 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: Grant
    Filed: August 3, 2001
    Date of Patent: April 15, 2003
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Tetsuyuki Kaneko, Naoki Ayai, Jun Fujikami, Shinichi Kobayashi
  • Publication number: 20030059734
    Abstract: 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: Application
    Filed: October 25, 2002
    Publication date: March 27, 2003
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Shinichi Kobayashi, Tetsuyuki Kaneko, Ryosuke Hata
  • Publication number: 20030029906
    Abstract: 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: Application
    Filed: September 26, 2002
    Publication date: February 13, 2003
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Tetsuyuki Kaneko
  • Patent number: 6507746
    Abstract: 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: Grant
    Filed: February 21, 2001
    Date of Patent: January 14, 2003
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Tetsuyuki Kaneko
  • Patent number: 6498302
    Abstract: 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: Grant
    Filed: March 30, 2001
    Date of Patent: December 24, 2002
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Tetsuyuki Kaneko
  • Patent number: 6493925
    Abstract: 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: Grant
    Filed: September 19, 2000
    Date of Patent: December 17, 2002
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Tetsuyuki Kaneko, Munetsugu Ueyama, Akira Mikumo, Naoki Ayai, Shin-ichi Kobayashi
  • Publication number: 20020043298
    Abstract: 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: Application
    Filed: August 3, 2001
    Publication date: April 18, 2002
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Tetsuyuki Kaneko, Naoki Ayai, Jun Fujikami, Shinichi Kobayashi
  • Publication number: 20020022576
    Abstract: 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: Application
    Filed: July 13, 2001
    Publication date: February 21, 2002
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Shinichi Kobayashi, Tetsuyuki Kaneko, Ryosuke Hata
  • Publication number: 20010044385
    Abstract: 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: Application
    Filed: March 30, 2001
    Publication date: November 22, 2001
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD..
    Inventor: Tetsuyuki Kaneko
  • Publication number: 20010021689
    Abstract: 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: Application
    Filed: February 21, 2001
    Publication date: September 13, 2001
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Tetsuyuki Kaneko
  • Patent number: 5936394
    Abstract: 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: Grant
    Filed: February 24, 1998
    Date of Patent: August 10, 1999
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Tetsuyuki Kaneko, Tetsuaki Sashida
  • Patent number: 5840659
    Abstract: 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: Grant
    Filed: March 14, 1997
    Date of Patent: November 24, 1998
    Assignees: Sumitomo Electric Industries, Ltd., Ube Industries Ltd., Matsushita Electrical Industrial Co., Ltd., International Superconductivity Technology Center
    Inventors: Tetsuyuki Kaneko, Kazuyuki Hamada, Hisao Yamauchi, Seiji Adachi, Shoji Tanaka