Patents by Inventor Fumio Hirahara

Fumio Hirahara 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).

  • Semiconductor device having at least three power terminals superposed on each other
    Patent number: 6885096
    Abstract: The present has an object of reducing a wiring resistance caused by the wiring metal such as bonding wire, and self-inductance, in a semiconductor device for large power, such as IGBT module. Therefore, the invention has at lest three or more power terminals superimposed on each other, wherein at least one semiconductor chip is connected electrically in a way to be sandwiched between predetermined two power terminals among the power terminals. A power terminal on one end among the aforementioned superposed power terminals and a power terminal on the other end among the superposed power terminals can be led out in the same direction, for example.
    Type: Grant
    Filed: July 10, 2001
    Date of Patent: April 26, 2005
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Fumio Hirahara, Kenichi Ogata
  • Semiconductor device having at least three power terminals superposed on each other
    Publication number: 20020024129
    Abstract: The present has an object of reducing a wiring resistance caused by the wiring metal such as bonding wire, and self-inductance, in a semiconductor device for large power, such as IGBT module. Therefore, the invention has at lest three or more power terminals superimposed on each other, wherein at least one semiconductor chip is connected electrically in a way to be sandwiched between predetermined two power terminals among the power terminals. A power terminal on one end among the aforementioned superposed power terminals and a power terminal on the other end among the superposed power terminals can be led out in the same direction, for example.
    Type: Application
    Filed: July 10, 2001
    Publication date: February 28, 2002
    Inventors: Fumio Hirahara, Kenichi Ogata
  • Power converter
    Patent number: D469059
    Type: Grant
    Filed: October 25, 2001
    Date of Patent: January 21, 2003
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masaru Ando, Yoshikatsu Nagashima, Jun Onodera, Fumio Hirahara, Keiichi Nishihara