Patents by Inventor Kusuo Takagai

Kusuo Takagai 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).

  • AC line filter
    Patent number: 4910482
    Abstract: An AC line filter in which a pair of windings are wound in an opposite dition to each other and are provided at opposing locations on a main core that forms a closed magnetic path. At least one auxiliary core which forms a shorter magnetic path than the main core is positioned adjacent the main core. The auxiliary core has at low frequency region an effective permeability higher than that of the main core. A portion of each of the pair of windings being provided in such a way that the portion is a concentrated winding which surrounds both the main core and the auxiliary core simultaneously.
    Type: Grant
    Filed: September 20, 1988
    Date of Patent: March 20, 1990
    Assignee: Nippon Telegraph and Telephone Corporation and Sanritsu Electric Company
    Inventors: Kusuo Takagai, Yuuzaburo Inoue