Patents by Inventor Hideo Ishizuka

Hideo Ishizuka 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 circuit breaker system and gas insulated circuit breaker monitoring method
    Patent number: 8199445
    Abstract: A gas insulated circuit breaker system has: a container that encapsulates insulating gas; a main contact in the container that opens/closes the main circuit; a resistor contact in the container, connected in parallel to the main contact, to be opened after elapse of a predetermined time after the main contact is opened and to be closed at a predetermined time before the main contact is closed; a resistor in the container, serially connected to the resistor contact and connected in parallel to the main contact together with the resistor contact; a temperature sensor that measures temperature of surrounding of the resistor; and a temperature estimation section that estimates a temperature of the resistor based on a timing of opening/closing operation of the main contact, a current flowing through the main circuit and the measured temperature.
    Type: Grant
    Filed: October 16, 2009
    Date of Patent: June 12, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shiro Maruyama, Takashi Nakajima, Hiroyuki Hayata, Kazuhide Bannai, Kozo Matsushita, Hideo Ishizuka
  • GAS INSULATED CIRCUIT BREAKER SYSTEM AND GAS INSULATED CIRCUIT BREAKER MONITORING METHOD
    Publication number: 20100102036
    Abstract: A gas insulated circuit breaker system has: a container that encapsulates insulating gas; a main contact in the container that opens/closes the main circuit; a resistor contact in the container, connected in parallel to the main contact, to be opened after elapse of a predetermined time after the main contact is opened and to be closed at a predetermined time before the main contact is closed; a resistor in the container, serially connected to the resistor contact and connected in parallel to the main contact together with the resistor contact; a temperature sensor that measures temperature of surrounding of the resistor; and a temperature estimation section that estimates a temperature of the resistor based on a timing of opening/closing operation of the main contact, a current flowing through the main circuit and the measured temperature.
    Type: Application
    Filed: October 16, 2009
    Publication date: April 29, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Shiro MARUYAMA, Takashi Nakajima, Hiroyuki Hayata, Kazuhide Bannai, Kozo Matsushita, Hideo Ishizuka
  • Valve assembling method and assembled valve checking method
    Patent number: 5289634
    Abstract: A valve assembling and checking method includes the steps of: using air pressure from a nozzle 50 to press a spring 4 against the inner wall of a valve hole 2 to hold the same in a vertical position; moving the spool 3 immediately above the valve hole and allowing the spool to fall from a spool holding means 30, and repeating clamping and unclamping actions to adjust the location of the spool so that the spool is correctly received in the valve hole 2.
    Type: Grant
    Filed: July 28, 1992
    Date of Patent: March 1, 1994
    Assignees: Honda Giken Kogyo Kabushiki Kaisha, Nitto Seiko Kabushiki Kaisha
    Inventors: Sueyoshi Makino, Tateyuki Inagi, Hideo Ishizuka, Tadashi Shimada, Asashi Nishikiori, Yoshiaki Suwa, Masahiko Adachi