Patents by Inventor Teruo Izumi
Teruo Izumi 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: 20090221427Abstract: A superconducting wire having at least a superconducting thin film and a stabilizing film formed one on top of another in order on a substrate having a predetermined width and a predetermined length, the superconducting wire having at least one cut made along a direction of the length of the superconducting wire, the superconducting wire being bendable at the cut in a width direction.Type: ApplicationFiled: January 23, 2009Publication date: September 3, 2009Applicants: THE FURUKAWA ELECTRIC CO., LTD., Int'l Superconductivity Tech Ctr, Juridical Fdn., National University Corp YOKOHAMA NATL. UNIVInventors: Masashi YAGI, Shinichi MUKOYAMA, Yuh SHIOHARA, Teruo IZUMI, Naoyuki AMEMIYA
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Publication number: 20090170708Abstract: Tape-shaped superconducting wires, and a superconducting coil formed from said wires, wherein a plurality of electrically separated superconducting film parts, each having a rectangular cross section and arranged in parallel, form parallel conductors, providing superconducting wires capable of containing losses incurred in the presence of alternating current (A/C). A superconducting coil is made by winding the superconducting wires, wherein the coil structure contains at least a part wherein perpendicular interlinkage magnetic fluxes acting among conductor elements of the parallel conductors by the distribution of magnetic fields generated by the superconducting coils cancel mutually in order to contain circulating current within the wires and to make shunt current uniform, thereby providing a low-loss A/C superconducting coil.Type: ApplicationFiled: October 3, 2008Publication date: July 2, 2009Applicants: INTERNATIONAL SUPERCONDUCTIVITY TECHNOLOGY CENTER, THE JURIDICIAL FOUNDATION, FUJI ELECTRIC SYSTEMS CO., LTD., FUJIKURA LTD., KAZUO FUNAKI, MASATAKA IWAKUMA, TAKANOBU KISUInventors: Kazuo Funaki, Masataka Iwakuma, Takanobu Kisu, Akira Tomioka, Toshio Uede, Hiroshi Fuji, Teruo Izumi, Yuh Shiohara
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Patent number: 7453340Abstract: Tape-shaped superconducting wires, and a superconducting coil formed from said wires, wherein a plurality of electrically separated superconducting film parts, each having a rectangular cross section and arranged in parallel, form parallel conductors, providing superconducting wires capable of containing losses incurred in the presence of alternating current (A/C). A superconducting coil is made by winding the superconducting wires, wherein the coil structure contains at least a part wherein perpendicular interlinkage magnetic fluxes acting among conductor elements of the parallel conductors by the distribution of magnetic fields generated by the superconducting coils cancel mutually in order to contain circulating current within the wires and to make shunt current uniform, thereby providing a low-loss A/C superconducting coil.Type: GrantFiled: July 13, 2004Date of Patent: November 18, 2008Assignees: International Superconductivity Technology Center, The Juridical Foundation, Fuji Electric Systems Co., Ltd., Fujikura Ltd.Inventors: Kazuo Funaki, Masataka Iwakuma, Takanobu Kisu, Akira Tomioka, Toshio Uede, Hiroshi Fuji, Teruo Izumi, Yuh Shiohara
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Patent number: 7431868Abstract: A metal substrate for an oxide superconducting wire, which comprises a polycrystalline metal substrate with a rolled aggregate structure having a {100} plane which is parallel to the rolled surface and a <001> axis which is parallel to the rolling direction, and an oxide crystal layer comprising an oxide of the polycrystalline metal and formed on a surface of the polycrystalline metal substrate, wherein at least 90% of grain boundaries in the oxide crystal layer have an inclination of 10° or less, and at least 90% of the {100} plane of the oxide crystal layer make an angle of 10° or less with the surface of the polycrystalline metal substrate.Type: GrantFiled: September 30, 2005Date of Patent: October 7, 2008Assignees: The Furukawa Electric Co., Ltd., International Superconductivity Technology Center, Sumitomo Electric Industries Ltd.Inventors: Toshihiko Maeda, Toru Izumi, Katsuya Hasegawa, Shigenobu Asada, Teruo Izumi, Yuh Shiohara
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Patent number: 7417425Abstract: A continuous observation apparatus of magnetic flux distribution in which a long sample containing a superconducting material or magnetic material is transferred to an observation position and magnetic flux is observed sequentially at each of certain areas along a longitudinal direction of the sample is provided. A method of continuously observing magnetic flux by which a long sample containing a superconducting material or magnetic material is transferred to an observation position and magnetic flux is observed sequentially at each of certain areas along a longitudinal direction of the sample is also provided.Type: GrantFiled: September 5, 2006Date of Patent: August 26, 2008Assignees: International Superconductivity Technology Center,the Juridical foundation, Fujikura Ltd.Inventors: Takato Machi, Noriko Chikumoto, Koichi Nakao, Hiroshi Fuji, Yutaka Kitoh, Teruo Izumi, Yuh Shiohara
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Patent number: 7394338Abstract: In one embodiment, a superconducting coil includes a tertiary parallel superconductor unit (60) composed of superposed in parallel a plurality of layers of secondary parallel superconductor units (50). The layers of secondary parallel superconductor units include a plurality of superconductor elements (40) arranged in parallel along the axial direction of the coil, forming a superconducting conductor unit. The tertiary parallel superconductor unit is wound on a bobbin (55). In another embodiment, the superconducting coil includes one or more layers of the secondary parallel superconductor unit wound on the bobbin. In both embodiments, the secondary parallel superconductor unit can include at least one non-superconducting conductor element (70). The layer of the secondary parallel superconductor unit forming an outer side of the tertiary parallel superconductor unit can include at least one non-superconducting conductor element.Type: GrantFiled: January 12, 2006Date of Patent: July 1, 2008Assignees: Fuji Electric Systems Co., Ltd., Fujikura Ltd., Railway Technical Research Institute, Superconductivity Research Laboratory, International Superconductivity Technology Center, The Juridical Foundation, Kyushu Electric Power Co., Inc.Inventors: Masataka Iwakuma, Akira Tomioka, Masayuki Konno, Hiroshi Fuji, Kenji Suzuki, Teruo Izumi, Yuh Shiohara, Hidemi Hayashi
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Publication number: 20070145100Abstract: The present invention is configured such that, in a low AC loss oxide superconductor constituted by providing an oxide superconducting layer 6 on a substrate 1, said oxide superconducting layer 6 is separated into a plurality of filament conductors 2 in parallel to the lengthwise direction of said substrate 1 by dividing grooves 3 plurally formed in the widthwise direction of said substrate, and a high-resistance oxide 8 is formed in said dividing grooves 3. Because of the invention, it is possible to increase the insulation properties of individually divided mated filament conductors, and to obtain an oxide superconductor that has low AC loss.Type: ApplicationFiled: November 16, 2006Publication date: June 28, 2007Applicants: RAILWAY TECHNICAL RESEARCH INSTITUTE, International Superconductivity Technology Center, the Juridical Foundation Eishin Kaihatsu BLDG, Kyushu University, National University CorporationInventors: Kenji Suzuki, Saburo Hoshi, Junko Matsuda, Teruo Izumi, Yuh Shiohara, Masataka Iwakuma
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Publication number: 20070108974Abstract: A continuous observation apparatus of magnetic flux distribution in which a long sample containing a superconducting material or magnetic material is transferred to an observation position and magnetic flux is observed sequentially at each of certain areas along a longitudinal direction of the sample is provided. A method of continuously observing magnetic flux by which a long sample containing a superconducting material or magnetic material is transferred to an observation position and magnetic flux is observed sequentially at each of certain areas along a longitudinal direction of the sample is also provided.Type: ApplicationFiled: September 5, 2006Publication date: May 17, 2007Inventors: Takato Machi, Noriko Chikumoto, Koichi Nakao, Hiroshi Fuji, Yutaka Kitoh, Teruo Izumi, Yuh Shiohara
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Publication number: 20060238928Abstract: In one embodiment, a superconducting coil includes a tertiary parallel superconductor unit (60) composed of superposed in parallel a plurality of layers of secondary parallel superconductor units (50). The layers of secondary parallel superconductor units include a plurality of superconductor elements (40) arranged in parallel along the axial direction of the coil, forming a superconducting conductor unit. The tertiary parallel superconductor unit is wound on a bobbin (55). In another embodiment, the superconducting coil includes one or more layers of the secondary parallel superconductor unit wound on the bobbin. In both embodiments, the secondary parallel superconductor unit can include at least one non-superconducting conductor element (70). The layer of the secondary parallel superconductor unit forming an outer side of the tertiary parallel superconductor unit can include at least one non-superconducting conductor element.Type: ApplicationFiled: January 12, 2006Publication date: October 26, 2006Applicants: Fuji Electric Systems Co., Ltd., Fujikura Ltd., Railway Technical Research Institute, The Juridical Foundation, Kyushu Electric Power Co., Inc.Inventors: Masataka Iwakuma, Akira Tomioka, Masayuki Konno, Hiroshi Fuji, Kenji Suzuki, Teruo Izumi, Yuh Shiohara, Hidemi Hayashi
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Publication number: 20060216407Abstract: A method of manufacturing a tape-formed oxide superconductor, in which a tape-formed wire material (6 in FIG. 1) is extended between a pair of reels (5a and 5b). Besides, a reactive gas is supplied form the gas supply ports of a reactive gas supply pipe (3a) vertically to the upper side film surface of the tape-formed wire material (6), so as to react the film body of this tape-formed wire material into a superconducting layer, while at the same time, a gas after the reaction is discharged from the gas discharge ports of discharge pipes (4a and 4b) for discharging the gas after the reaction. Likewise, the reactive gas is supplied vertically to the lower side film surface of the tape-formed wire material (6), so as to react the film body of this tape-formed wire material into a superconducting layer, while at the same time, the gas after the reaction is discharged from the gas discharge ports of discharge pipes (4c and 4d) for discharging the gas after the reaction.Type: ApplicationFiled: March 22, 2006Publication date: September 28, 2006Applicants: International Superconductivity Technology Center, The Juridical Foundation, Showa Electric Wire & Cable Co., Ltd., Fujikura Ltd.Inventors: Yuji Aoki, Hiroshi Fuji, Sukeharu Nomoto, Ryo Teranishi, Teruo Izumi, Yuh Shiohara
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Publication number: 20060166831Abstract: The invention relates to a technique for forming a thin film of good quality on a base substance via an intermediate layer. Such a film formation technique is suitably applicable to formation of an oxide high-temperature superconductor thin film usable for a superconducting wire material, a superconducting device or the like. In the method of forming a thin film on a base substance via an intermediate layer, an interface energy Ea at an interface A between the base substance and the intermediate layer, an interface energy Eb at an interface B between the intermediate layer and the thin film, and an interface energy Ec at an interface C between the base substance and the thin film in a state where the intermediate layer is omitted are calculated, and then a substance for the intermediate layer is selected so as to satisfy conditions of Ea<Ec and Eb<Ec.Type: ApplicationFiled: October 29, 2003Publication date: July 27, 2006Applicants: Sumitomo Electric Industries, Ltd., International Superconductivity Technology center, the Juridical FoundationInventors: Katsuya Hasegawa, Teruo Izumi, Yuh Shiohara, Yoshihiro Sugawara, Tsukasa Hirayama, Fumiyasu Oba, Yuichi Ikuhara
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Publication number: 20060077025Abstract: Tape-shaped superconducting wires are made by forming a superconducting film on the substrate. At least the superconducting film is slit, electrically separated into a plurality of superconducting film parts each having a rectangular cross section and arranged in parallel to form parallel conductors. This provides superconducting wires capable of containing AC loss. A superconducting coil is made by winding the superconducting wires described above, wherein the provision of a coil structure containing at least partially a part wherein the perpendicular interlinkage magnetic flux acting among various conductor elements of the parallel conductors by the distribution of the magnetic field generated by the superconducting coils cancel mutually enables a simple structure without transposition to cancel mutually the interlinkage magnetic flux by the perpendicular magnetic field against wires, to contain circulating current within the wires by the perpendicular magnetic field and to make shunt current uniform.Type: ApplicationFiled: July 13, 2004Publication date: April 13, 2006Inventors: Kazuo Funaki, Masataka Iwakuma, Takanobu Kisu, Akira Tomioka, Toshio Uede, Hiroshi Fuji, Teruo Izumi, Yuh Shiohara
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Publication number: 20060019832Abstract: A metal substrate for an oxide superconducting wire, which comprises a polycrystalline metal substrate with a rolled aggregate structure having a {100} plane which is parallel to the rolled surface and a <001> axis which is parallel to the rolling direction, and an oxide crystal layer comprising an oxide of the polycrystalline metal and formed on a surface of the polycrystalline metal substrate, wherein at least 90% of grain boundaries in the oxide crystal layer have an inclination of 10° or less, and at least 90% of the {100} plane of the oxide crystal layer make an angle of 10° or less with the surface of the polycrystalline metal substrate.Type: ApplicationFiled: September 30, 2005Publication date: January 26, 2006Applicants: The Furukawa Electric Co., Ltd., International Superconductivity Technology Ctr., Sumitomo Electric Industries, Ltd.Inventors: Toshihiko Maeda, Toru Izumi, Katsuya Hasegawa, Shigenobu Asada, Teruo Izumi, Yuh Shiohara
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Publication number: 20060009362Abstract: The invention relates to a technique for forming a single crystalline thin film of good quality on an underlayer. Such a technique is suitably applicable to provision of an oxide high-temperature superconductor thin film usable for a superconducting wire material, a superconducting device or the like. The single crystalline thin film formed on a substratum is made of a substance different from that of the substratum. A specific atomic layer contained in common in the substratum and the thin film is shared at an interface between the substratum and the thin film. In a region as adjacent to the interface as 100 or fewer unit cells of the thin film apart from the interface, a ratio of crystalline region having grown with an orientation of ±2 degrees or less deviation angle on the basis of a crystal orientation of the substratum is 50% or more.Type: ApplicationFiled: October 29, 2003Publication date: January 12, 2006Inventors: Katsuya Hasegawa, Teruo Izumi, Yuh Shiohara, Yoshihiro Sugawara, Tsukasa Hirayama, Fumiyasu Oba, Yuichi Ikuhara
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Publication number: 20040235671Abstract: A persistent current switch which operates at operating temperature higher than that of a metallic superconducting wire, and which is smaller, lighter and higher in electric resistance in a normal conducting state than a superconducting Ag sheathed wire. An LPE film formed in a meandering shape or a spiral shape for an elongated conducting route can fulfill the above requirements. The shape can be controlled by LPE growth from a pre-processed seed film or by processing after growth.Type: ApplicationFiled: March 19, 2004Publication date: November 25, 2004Inventors: Teruo Izumi, Xin Yao, Masahiko Kai, Katsumi Nomura, Yuh Shiohara
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Publication number: 20040224851Abstract: An oxide superconductor of the present invention characterized in that it comprises: a substrate 1 made of metals having a high melting temperature; at least one oxide intermediate layer 2 and 3 which is formed on at least one surface of the substrate 1; and a thick film oxide superconductor layer 5 which is formed on the oxide intermediate layer 2 and 3 by the liquid phase epitaxial method in which the substrate 1 provided with the oxide intermediate layer 2 and 3 is put into a solution 7 containing the elements comprising an oxide superconductor layer, and is then pulled out from the solution 7.Type: ApplicationFiled: April 26, 2004Publication date: November 11, 2004Inventors: Kazuomi Kakimoto, Natsuro Hobara, Teruo Izumi, Yuh Shiohara, Yuichi Nakamura, Kazuya Ohmatsu, Koso Fujino
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Patent number: 6743533Abstract: An oxide superconductor of the present invention characterized in that it comprises: a substrate 1 made of metals having a high melting temperature; at least one oxide intermediate layer 2 and 3 which is formed on at least one surface of the substrate 1; and a thick film oxide superconductor layer 5 which is formed on the oxide intermediate layer 2 and 3 the liquid phase epitaxial method in which the substrate 1 provided with the oxide intermediate layer 2 and 3 is put into a solution 7 containing the elements comprising an oxide superconductor layer, and is then pulled out from the solution 7.Type: GrantFiled: December 11, 2001Date of Patent: June 1, 2004Assignees: Fujikura Ltd., Tokyo Electric Power Company, Inc., Railway Technical Research Institute, Sumitomo Electric Industries, Ltd., International Superconductivity Technology CenterInventors: Kazuomi Kakimoto, Natsuro Hobara, Teruo Izumi, Yuh Shiohara, Yuichi Nakamura, Kazuya Ohmatsu, Koso Fujino
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Publication number: 20040026118Abstract: An oxide superconducting wire composed of a metal substrate, an intermediate layer vapor-deposited by an ion beam assisted deposition method (IBAD method) on the metal substrate, a CeO2 cap layer vapor-deposited on the intermediate layer by the PLD method or another such method, and an oxide superconducting film formed on the cap layer, wherein the thickness of the intermediate layer is no more than 2000 nm, and the thickness of the cap layer is at least 50 nm. The time it takes to form a film by the IBAD method can be shortened, and the orientation of the resulting superconducting film can be improved, by reducing the thickness of the intermediate layer manufactured by the IBAD method as above and increasing the thickness of the cap layer. The oxide superconducting wire can be obtained at low cost and with high critical current density.Type: ApplicationFiled: August 4, 2003Publication date: February 12, 2004Inventors: Takemi Muroga, Yutaka Yamada, Takeshi Araki, Izumi Hirabayashi, Teruo Izumi, Yuh Shiohara, Yasuhiro Iijima
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Publication number: 20030176287Abstract: The present invention provides an oxide superconducting conductor A comprising an oxide buffer layer 2 on a base material 1 composed of a high melting point metal, a solid solution layer 4 having a structure similar to an oxide superconducting substance containing constituent elements of the oxide buffer layer 2 on the oxide buffer layer 2, and an oxide superconducting layer having a peritectic temperature lower than that of the solid solution layer 4 having a structure similar to an oxide superconducting substance on the solid solution layer 4 having a structure similar to an oxide superconducting substance.Type: ApplicationFiled: February 13, 2003Publication date: September 18, 2003Inventors: Kazuomi Kakimoto, Toru Izumi, Natsuro Hobara, Yuichi Nakamura, Teruo Izumi, Yuh Shiohara
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Patent number: 6613463Abstract: A superconducting laminated oxide substrate, which comprises a laminate a layer of a superconducting oxide crystal substrate made of a superconducting oxide single crystal or a superconducting oxide polycrystal and a layer of a reinforcing crystal substrate, prevents cracks from occurring in the superconducting oxide crystal substrate due to the heat treatment conducted for the purpose of forming an insulation film or a conductor film, and provides easy connectivity between electrodes and wiring formed on substrates located at upper and lower positions.Type: GrantFiled: September 1, 2000Date of Patent: September 2, 2003Assignee: International Superconductivity Technology CenterInventors: Teruo Izumi, Satoshi Koyama, Yuh Shiohara, Shoji Tanaka, Masahiro Egami, Youichi Enomoto, Hideo Suzuki, Michitomo Iiyama