Patents by Inventor Nobuyoshi Tsukiyama

Nobuyoshi Tsukiyama 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).

  • Ferrite electrode material
    Patent number: 4390461
    Abstract: A ferrite electrode material composed principally of a composition comprising barium oxide and iron oxide and having been calcined with heating in an inert gas atmosphere is excellent in minimizing energy loss and suppressing high-frequency noise.
    Type: Grant
    Filed: April 3, 1981
    Date of Patent: June 28, 1983
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyoshi Tsukiyama, Ryo Ichige