Patents by Inventor Keisuke Etoh
Keisuke Etoh 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: 7279639Abstract: A superconducting cable joint structure is a structure used to joint together superconducting cables used at cryogenic temperature or to joint together a terminal of the superconducting cable and a normal conducting cable, and it includes a joint insulation layer arranged radially outer than a portion connecting the superconducting cables' respective conductors together or the superconducting cable's conductor and the normal conducting cable's conductor together, and at least one coolant path provided at the joint insulation layer to cool the portion connecting the conductors together. The cable cores can have their connection prevented from generating heat to have an increased temperature.Type: GrantFiled: July 20, 2006Date of Patent: October 9, 2007Assignees: Sumitomo Electric Industries, Ltd., The Tokyo Electric Power Company, IncorporatedInventors: Yuuichi Ashibe, Yoshihisa Takahashi, Shoichi Honjo, Keisuke Etoh
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Patent number: 7168744Abstract: A first flange and a second flange are superposed and fastened with a bolt and a nut in a fastening operation, to implement a fastening structure used at temperature lower than atmospheric temperature for the fastening operation. Assuming that the first flange has a thickness L1 and a coefficient of linear expansion ?1, the second flange has a thickness L2 and a coefficient of linear expansion ?2, superposed first flange and second flange have a thickness L, and the bolt has a coefficient of linear expansion ?, a relation of L·??L1·?1+L2·?2 is satisfied, i.e. heat shrinkage of the bolt is not smaller than the total heat shrinkage of the first and second flanges. Thus, impairment of sealing property due to heat shrinkage is avoided at a flange junction used at low temperature.Type: GrantFiled: May 14, 2004Date of Patent: January 30, 2007Assignees: Sumitomo Electric Industries, Tokyo Electric Power CompanyInventors: Yuuichi Ashibe, Takato Masuda, Yoshihisa Takahashi, Shoichi Honjo, Masato Shimodate, Keisuke Etoh
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Patent number: 7148423Abstract: A phase split structure of a superconducting cable includes three cable cores each having a shield layer provided around a superconductor, a splitter box housing the three cable cores extending from an assembly portion where the three cable cores are assembled into the cable, in a state in which the cable cores are spaced apart from each other, and a shield connecting portion connecting respective shield layers of the cable cores to each other within the splitter box. The shield connecting portion allows the cable cores to have their respective shield layers connected together with low resistance and each shield layer can pass a current substantially equal in magnitude to that which each superconductor passes. Thus in each shield layer a magnetic field can be formed having a level that can cancel a magnetic field generated from each superconductor. The structure can thus effectively prevent a large magnetic field external to the cable core.Type: GrantFiled: June 8, 2004Date of Patent: December 12, 2006Assignees: Sumitomo Electric Industries, Ltd, The Tokyo Electric Power Company IncorporatedInventors: Takato Masuda, Hiroyasu Yumura, Yoshihisa Takahashi, Shoichi Honjo, Keisuke Etoh
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Publication number: 20060254804Abstract: A superconducting cable joint structure is a structure used to joint together superconducting cables used at cryogenic temperature or to joint together a terminal of the superconducting cable and a normal conducting cable, and it includes a joint insulation layer arranged radially outer than a portion connecting the superconducting cables' respective conductors together or the superconducting cable's conductor and the normal conducting cable's conductor together, and at least one coolant path provided at the joint insulation layer to cool the portion connecting the conductors together. The cable cores can have their connection prevented from generating heat to have an increased temperature.Type: ApplicationFiled: July 20, 2006Publication date: November 16, 2006Inventors: Yuuichi Ashibe, Yoshihisa Takahashi, Shoichi Honjo, Keisuke Etoh
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Patent number: 7094973Abstract: A superconducting cable joint structure is a structure used to joint together superconducting cables used at cryogenic temperature or to joint together a terminal of the superconducting cable and a normal conducting cable, and it includes a joint insulation layer arranged radially outer than a portion connecting the superconducting cables' respective conductors together or the superconducting cable's conductor and the normal conducting cable's conductor together, and at least one coolant path provided at the joint insulation layer to cool the portion connecting the conductors together. The cable cores can have their connection prevented from generating heat to have an increased temperature.Type: GrantFiled: May 7, 2004Date of Patent: August 22, 2006Assignees: Sumitomo Electric Industries, Ltd., The Tokyo Electric Power Company, IncorporatedInventors: Yuuichi Ashibe, Yoshihisa Takahashi, Shoichi Honjo, Keisuke Etoh
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Publication number: 20040256855Abstract: A first flange and a second flange are superposed and fastened with a bolt and a nut in a fastening operation, to implement a fastening structure used at temperature lower than atmospheric temperature for the fastening operation. Assuming that the first flange has a thickness L1 and a coefficient of linear expansion &agr;1, the second flange has a thickness L2 and a coefficient of linear expansion &agr;2, superposed first flange and second flange have a thickness L, and the bolt has a coefficient of linear expansion &agr;, a relation of L·&agr;≧L1·&agr;1+L2·&agr;2 is satisfied, i.e. heat shrinkage of the bolt is not smaller than the total heat shrinkage of the first and second flanges. Thus, impairment of sealing property due to heat shrinkage is avoided at a flange junction used at low temperature.Type: ApplicationFiled: May 14, 2004Publication date: December 23, 2004Applicants: Sumitomo Electric Industries, Ltd., The Tokyo Electric Power Company, IncorporatedInventors: Yuuichi Ashibe, Takato Masuda, Yoshihisa Takahashi, Shoichi Honjo, Masato Shimodate, Keisuke Etoh
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Publication number: 20040256126Abstract: A superconducting cable joint structure is a structure used to joint together superconducting cables used at cryogenic temperature or to joint together a terminal of the superconducting cable and a normal conducting cable, and it includes a joint insulation layer arranged radially outer than a portion connecting the superconducting cables' respective conductors together or the superconducting cable's conductor and the normal conducting cable's conductor together, and at least one coolant path provided at the joint insulation layer to cool the portion connecting the conductors together. The cable cores can have their connection prevented from generating heat to have an increased temperature.Type: ApplicationFiled: May 7, 2004Publication date: December 23, 2004Applicants: Sumitomo Electric Industries, Ltd., The Tokyo Electric Power Company, IncorporatedInventors: Yuuichi Ashibe, Yoshihisa Takahashi, Shoichi Honjo, Keisuke Etoh
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Publication number: 20040256144Abstract: A phase split structure of a superconducting cable includes three cable cores each having a shield layer provided around a superconductor, a splitter box housing the three cable cores extending from an assembly portion where the three cable cores are assembled into the cable, in a state in which the cable cores are spaced apart from each other, and a shield connecting portion connecting respective shield layers of the cable cores to each other within the splitter box. The shield connecting portion allows the cable cores to have their respective shield layers connected together with low resistance and each shield layer can pass a current substantially equal in magnitude to that which each superconductor passes. Thus in each shield layer a magnetic field can be formed having a level that can cancel a magnetic field generated from each superconductor. The structure can thus effectively prevent a large magnetic field external to the cable core.Type: ApplicationFiled: June 8, 2004Publication date: December 23, 2004Applicants: Sumitomo Electric Industries, Ltd., The Tokyo Electric Power Company, IncorporatedInventors: Takato Masuda, Hiroyasu Yumura, Yoshihisa Takahashi, Shoichi Honjo, Keisuke Etoh