Patents by Inventor Chikara Fujisawa

Chikara Fujisawa 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).

  • Gas-insulated switchgear
    Patent number: 6664493
    Abstract: A gas-insulated switchgear of an 1½ CB system, in which three circuit breakers are electrically connected in series between a pair of buses and a connecting line for supplying and receiving electric power is led out from between the circuit breakers, is characterized in that new connecting lines for supplying and receiving electric power are led out from the main buses through disconnecting switches to a diameter which is an end portion of the gas-insulated switchgear. A leading out side of the connecting lines is outside the main bus, and an installation area of the gas-insulated switch gear is not increased.
    Type: Grant
    Filed: September 19, 2002
    Date of Patent: December 16, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Hitoshi Yamada, Mamoru Okabe, Toshihisa Miyamoto, Isamu Ozawa, Chikara Fujisawa
  • Gas-insulated switchgear
    Publication number: 20030111443
    Abstract: A gas-insulated switchgear of an 1.1/2CB system, in which three circuit breakers are electrically connected in series between a pair of buses and a connecting line for supplying and receiving electric power is led out from between the circuit breakers, is characterized in that new connecting lines for supplying and receiving electric power are led out from the main buses through disconnecting switches to a diameter which is an end portion of the gas-insulated switchgear. A leading out side of the connecting lines is outside the main bus, and an installation area of the gas-insulated switch gear is not increased.
    Type: Application
    Filed: September 19, 2002
    Publication date: June 19, 2003
    Inventors: Hitoshi Yamada, Mamoru Okabe, Toshihisa Miyamoto, Isamu Ozawa, Chikara Fujisawa