Patents by Inventor Kiyosumi Tsuchiya

Kiyosumi Tsuchiya 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).

  • Precursor wire for NbAl superconducting wire, NbAl superconducting wire, method for producing precursor wire for NbAl superconducting wire, and method for producing NbAl superconducting wire
    Patent number: 9680081
    Abstract: Problem There is proposed an innovative cross-sectional structure, with an idea contrary to the conventional one, utilizing the non-reactivity between Cu and Ta (or between Ag and Nb, Ta) in a high-temperature short-time heat treatment, thus achieving (1) the suppression of the low magnetic-field instability, (2) excellent wire drawability of a precursor wire, and (3) the reduction of the cost required for the incorporation of a stabilizer. Means for Resolution There is proposed a structure having an assembly of a plurality of single wires, wherein the assembly is covered with an outer cover (skin) formed from Nb or Ta, wherein each of the single wires has an Nb/Al composite filament region which is formed from a composite of Nb and Al mixed in an Nb:Al molar ratio of 3:1, and which is covered with a partition formed from Nb or Ta, and further covered with an interfilamentary barrier formed from Cu or Ag disposed around the partition.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: June 13, 2017
    Assignees: NATIONAL INSTITUTE FOR MATERIAL SCIENCE, INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION
    Inventors: Takao Takeuchi, Kiyosumi Tsuchiya, Kazuhiko Nakagawa