Patents by Inventor Syunji Itoh

Syunji Itoh 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).

  • Patent number: 5146387
    Abstract: An interrupter unit comprising, an interrupter including at least two pairs of contacts, and an interrupter container surrounding the pairs of contacts, each of the pairs of contacts having a first contact and a second contact which contacts the first contact or is positioned away from the first contact so that electricity flows between the first contact and the second contact or is prevented from flowing between the first contact and the second contact, an electric actuator device for driving the pairs of contacts so that the second contacts contact the first contacts or are positioned away from the first contacts, and at least one voltage-transformer which transforms an input voltage and supplies a suitably transformed voltage to the electric actuator device so that the electric actuator device drives the pairs of contacts, wherein the interrupter unit further comprises an electrically grounded cover surrounding the interrupter and having first cover terminals which are electrically connected to the first c
    Type: Grant
    Filed: April 11, 1990
    Date of Patent: September 8, 1992
    Assignee: Hitachi, Ltd.
    Inventors: Syunji Itoh, Takahide Seki, Haruo Honda
  • Patent number: 5045651
    Abstract: A switch provided with a negative pressure chamber which is actuated in association with the separating operation of a movable contact. The negative pressure chamber is connected to a means for supplying a fluid to the negative pressure chamber so as to suppress the negative pressure in the negative pressure chamber during the initial stage of the separaating operation of the movable contact.
    Type: Grant
    Filed: January 26, 1990
    Date of Patent: September 3, 1991
    Assignee: Hitachi, Ltd.
    Inventors: Takahide Seki, Yasuharu Seki, Masanori Tsukushi, Syunji Itoh, Haruo Honda
  • Patent number: 5023415
    Abstract: A switch apparatus for use in a distribution system, having a case, a pair of bushings arranged on the case so as to oppose each other, and a breaker arranged in the case such that breaking and closing actions take place in a direction perpendicular to an imaginary line interconnecting the pair of bushings. Both terminals of the breaker are connected to the corresponding bushings through conductors.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: June 11, 1991
    Assignee: Hitachi, Ltd.
    Inventors: Syunji Itoh, Hiroshi Kozawa, Takahide Seki