Patents by Inventor Jun-ichi Shinagawa

Jun-ichi Shinagawa 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).

  • Cable fault location method with discharge delay compensation using multiple pulses with different rates of voltage increase
    Patent number: 5319311
    Abstract: Two or more rising pulse waves having different rates of voltage increase are applied to a measuring end of a cable and reflected waves from a fault point on the cable are detected to measure a turnaround propagation time between the measuring end and the fault point. Additionally, ratios of the rates of voltage increase of one pulse wave and the other pulse waves are calculated. A discharge delay time at the fault point is calculated from time differences of the measured turnaround propagation time and the ratios of the voltage increasing speeds and the discharge delay time is subtracted from the measured turnaround propagation time to calculate a real turnaround propagation time.
    Type: Grant
    Filed: March 12, 1992
    Date of Patent: June 7, 1994
    Assignees: Chuba Electric Power Company, Inc., Showa Electric Wire and Cable Co., Ltd.
    Inventors: Takao Kawashima, Masayoshi Arakane, Hitoshi Sugiyama, Tatenori Kano, Yasutaka Fujiwara, Jun-ichi Shinagawa, Hideki Yamamura