Patents by Inventor Keiji Sumiya

Keiji Sumiya 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).

  • Superconducting thick film circuit board, production thereof, thick film superconductor and production thereof
    Patent number: 5147851
    Abstract: A superconducting thick film circuit board or thick film superconductor obtained by forming a rod-like crystal superconducting composite layer comprising a superconductor made of a compound of M-Ba-Cu-O, M being Y and/or a lanthanide element, and a composite of Ag and Pt on a stabilized zirconia substrate has a high Jc value and good superconducting properties.
    Type: Grant
    Filed: October 30, 1989
    Date of Patent: September 15, 1992
    Assignee: Hitachi Chemical Company Ltd.
    Inventors: Shozo Yamana, Hideji Kuwajima, Minoru Ishihara, Keiji Sumiya, Toranosuke Ashizawa, Shuichiro Shimoda