Patents by Inventor Norikiyo Koizumi

Norikiyo Koizumi 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).

  • Nb.sub.3 Al multi-filamentary superconducting wire
    Patent number: 5891585
    Abstract: An Nb.sub.3 Al multi-filamentary superconducting wire capable of realizing both stabilization of a superconducting state and increase in capacity is provided. The Nb.sub.3 Al multi-filamentary superconducting wire includes a core formed of copper or copper alloy and located at the center of the wire; a multi-filamentary superconductor layer located around the core and having filaments containing Nb and Al as constituent elements embedded in a matrix formed of copper or copper alloy; and a high resistance layer located around the multi-filamentary superconductor layer, and is characterized in that a sectional area of the core is at least 15% of the total sectional area of the core and the matrix and that the core and the matrix are formed of copper or copper alloy of at least 99.9% purity.
    Type: Grant
    Filed: November 1, 1996
    Date of Patent: April 6, 1999
    Assignees: Sumitomo Elkectric Industries, Ltd., Japan Atomic Energy Research Institute
    Inventors: Naoki Ayai, Yuichi Yamada, Akira Mikumo, Kenichi Takahashi, Norikiyo Koizumi, Toshinari Ando, Makoto Sugimoto, Hiroshi Tsuji