Patents by Inventor Masaru Miyagawa

Masaru Miyagawa 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
    Publication number: 20060152890
    Abstract: A switchgear has an insulating container filled with an insulating gas, a fixed current-carrying shaft fixed airtightly to one opening of the insulating container, a fixed contact provided on an end of the fixed current-carrying shaft in the insulating container, a movable contact configured to separably contact the fixed contact, a movable current-carrying shaft having the movable contact provided on an end and airtightly movably penetrating the other opening of the insulating container, and an operation mechanism coupled with the movable current-carrying shaft at an outside of the insulating container. The insulating container is constituted by a plurality of insulating layers, and the insulating layers are higher in dielectric constant as closer to an inside of the insulating container.
    Type: Application
    Filed: December 20, 2005
    Publication date: July 13, 2006
    Inventors: Kunio Yokokura, Tetsu Shioiri, Osamu Sakaguchi, Toshio Shimizu, Masaru Miyagawa, Susumu Kinoshita, Satoshi Makishima, Junichi Sato
  • Switch gear and method of manufacturing thereof
    Patent number: 6897396
    Abstract: By molding a plurality of vacuum valves (7), (13) having differing functions together with an input member (3) and an output member (21) en bloc in a resin layer (23) to form a switch gear (1), the present invention seeks to achieve dielectric strength without resorting to the use of SF6 gas, while rendering the whole device more compact and reducing both the number of parts and the man hours required for molding.
    Type: Grant
    Filed: December 1, 2000
    Date of Patent: May 24, 2005
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshihiro Ito, Susumu Kinoshita, Satoshi Makishima, Hiroki Sekiya, Masaru Miyagawa, Toshio Shimizu
  • Molded electric device and method for making molded electric device
    Publication number: 20050029001
    Abstract: A molded electric device having an insulated casing made of ceramics that has higher dielectric strength. The molded electric device includes an insulated casing, an endplate, an electric component and an electric insulating layer. The insulated casing is made of ceramics and has an end and an unglazed outer surface. The endplate is fitted to the end of the insulated casing. The electric component is accommodated in the insulated casing by the endplate. The electric insulating layer is molded to the unglazed outer surface of the insulated casing.
    Type: Application
    Filed: July 22, 2004
    Publication date: February 10, 2005
    Inventors: Junichi Sato, Osamu Sakaguchi, Masaru Miyagawa, Satoshi Makishima, Susumu Kinoshita
  • Switch gear and method of manufacturing thereof
    Publication number: 20010002666
    Abstract: By molding a plurality of vacuum valves (7), (13) having differing functions together with an input member (3) and an output member (21) en bloc in a resin layer (23) to form a switch gear (1), the present invention seeks to achieve dielectric strength without resorting to the use of SF6 gas, while rendering the whole device more compact and reducing both the number of parts and the man hours required for molding.
    Type: Application
    Filed: December 1, 2000
    Publication date: June 7, 2001
    Inventors: Yoshihiro Ito, Susumu Kinoshita, Satoshi Makishima, Hiroki Sekiya, Masaru Miyagawa, Toshio Shimizu