Patents by Inventor Hirofumi Kubo

Hirofumi Kubo 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).

  • Transformer with a surface shield layer
    Patent number: 4586015
    Abstract: A transformer having a molded coil which can stably sustain an electric-shock free function for a long period of time. The transformer has a grounded conductive shield layer on the surface of the molded coil. The shield layer is composed of a plurality of segments so that a stable bonding of the shield layer to resin is kept for a long period of time, with the respective segments being grounded by a conductor.
    Type: Grant
    Filed: June 20, 1983
    Date of Patent: April 29, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Yasuyuki Takahara, Hirofumi Kubo, Shigeo Hosaka, Tomomi Izuna, Toshiyuki Fujimori
  • Molded coil structure
    Patent number: 4496926
    Abstract: An economical and light-weight molded coil structure wherein sheet-form electrical insulator layers containing a thermosetting resin are wrapped around the inner and outer peripheries of a coil to function as a casting mold, and end-enclosing resin layers are applied to the both end faces respectively of the coil not covered with the sheet-form insulator layers. A gas is charged to be sealed in the coil.
    Type: Grant
    Filed: April 20, 1982
    Date of Patent: January 29, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Hirofumi Kubo, Toshiyuki Fujimori