Patents by Inventor Fujimaro Imaizumi

Fujimaro Imaizumi 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).

  • Static power converter controlling apparatus for reducing noise generated by phase shift control
    Patent number: 4020411
    Abstract: A static power converter includes a plurality of thyristor bridges. The level of the control voltage is measured and a signal representative of the measured level is generated which causes one thyristor bridge to maintain a substantially zero output D.C. voltage, while another thyristor bridge operates with phase shift control.
    Type: Grant
    Filed: February 21, 1975
    Date of Patent: April 26, 1977
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Tsuboi, Kyozo Tachibana, Kaoru Tamura, Fujimaro Imaizumi