Patents by Inventor Yutaka Akiba

Yutaka Akiba 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).

  • Litz wire for degreasing skin effect at high frequency
    Patent number: 4549042
    Abstract: A litz wire comprises three or more insulated strands consisting essentially of an inner conductor and an outer insulating layer on said conductor. The strands are twisted symmetrically with respect to the center line of the wire, so that a current density distribution in the litz wire becomes uniform. Three or more such litz wires are twisted to form a composite litz wire. The composite litz wires are suitable for use in a high-frequency coil.
    Type: Grant
    Filed: August 2, 1982
    Date of Patent: October 22, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Yutaka Akiba, Kazuo Hirota
  • Litz wire
    Patent number: 4546210
    Abstract: A plurality of strands each comprising a conductor covered with an insulating layer and then with an adhesive layer are twisted together and fixed to each other by fusing of the adjacent adhesive layers to form a litz wire which will not be deformed even by an external force.
    Type: Grant
    Filed: June 3, 1983
    Date of Patent: October 8, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Yutaka Akiba, Toshio Futami, Teruo Suda