Patents by Inventor Katunori Kojima

Katunori Kojima 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).

  • Vacuum switch and vacuum switchgear using the same
    Patent number: 6498314
    Abstract: A vacuum switch comprises a first vacuum container containing therein a circuit breaker, a second vacuum container containing therein the first vacuum container and grounded, and a third vacuum container connected to the second vacuum container, containing therein a disconnecting switch and an earth device and grounded. The second and third vacuum containers are isolated in vacuum from the first vacuum container, and the second vacuum container is electrically insulated from the first vacuum container. The second vacuum container contains an insulator fixed to a conductor connected to the circuit breaker and a movable rod partially disposed out of the vacuum containers and operating the circuit breaker to open and close. The disconnecting switch, circuit breaker and the insulator are arranged in a line. A vacuum switchgear comprises the above-mentioned vacuum switches of the number corresponding to three phases and necessary components, each being contained in a metal box.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: December 24, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Takuya Miyo, Toru Tanimizu, Syuuichi Kikukawa, Katunori Kojima, Ayumu Morita, Hiroshi Yokoyama, Koichi Murata, Ryotaro Hanabuchi
  • Vacuum switch and vacuum switchgear using the same
    Publication number: 20020134756
    Abstract: A vacuum switch comprises a first vacuum container containing therein a circuit breaker, a second vacuum container containing therein the first vacuum container and grounded, and a third vacuum container connected to the second vacuum container, containing therein a disconnecting switch and an earth device and grounded. The second and third vacuum containers are isolated in vacuum from the first vacuum container, and the second vacuum container is electrically insulated from the first vacuum container. The second vacuum container contains an insulator fixed to a conductor connected to the circuit breaker and a movable rod partially disposed out of the vacuum containers and operating the circuit breaker to open and close. The disconnecting switch, circuit breaker and the insulator are arranged in a line. A vacuum switchgear comprises the above-mentioned vacuum switches of the number corresponding to three phases and necessary components, each being contained in a metal box.
    Type: Application
    Filed: May 23, 2002
    Publication date: September 26, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Takuya Miyo, Toru Tanimizu, Syuuichi Kikukawa, Katunori Kojima, Ayumu Morita, Hiroshi Yokoyama, Koichi Murata, Ryotaro Hanabuchi
  • Vacuum switch and vacuum switchgear using the same
    Publication number: 20010040146
    Abstract: A vacuum switch comprises a first vacuum container containing therein a circuit breaker, a second vacuum container containing therein the first vacuum container and grounded, and a third vacuum container connected to the second vacuum container, containing therein a disconnecting switch and an earth device and grounded. The second and third vacuum containers are isolated in vacuum from the first vacuum container, and the second vacuum container is electrically insulated from the first vacuum container. The second vacuum container contains an insulator fixed to a conductor connected to the circuit breaker and a movable rod partially disposed out of the vacuum containers and operating the circuit breaker to open and close. The disconnecting switch, circuit breaker and the insulator are arranged in a line. A vacuum switchgear comprises the above-mentioned vacuum switches of the number corresponding to three phases and necessary components, each being contained in a metal box.
    Type: Application
    Filed: April 18, 2001
    Publication date: November 15, 2001
    Inventors: Takuya Miyo, Toru Tanimizu, Syuuichi Kikukawa, Katunori Kojima, Ayumu Morita, Hiroshi Yokoyama, Koichi Murata, Ryotaro Hanabuchi