Patents by Inventor Hisatoshi Arita

Hisatoshi Arita 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).

  • Power semiconductor device, armoring case thereof and method for manufacturing the same
    Patent number: 5825085
    Abstract: The present invention implements an armoring case of a power semiconductor device which can prevent cracks from occurring by inserting the terminal portion of an electrode plate in the inserting hole of the armoring case and then bending the same, misregistration from occurring between the fastening bolt inserting hole of the terminal portion and the screw portion of a terminal nut, and the like, and which can easily be assembled automatically. A terminal nut cover is previously molded. The terminal nut cover includes a first concave portion which can cover and support the terminal nut so as not to rotate when fastening a bolt, and a second concave portion into which the tip of the screw portion of the bolt can project. The electrode plate whose terminal portion is previously bent into a predetermined shape by a press machine or the like, and the terminal nut cover having the terminal nut inserted in and supported by the first concave portion are provided in a metal mold for the armoring case.
    Type: Grant
    Filed: March 12, 1996
    Date of Patent: October 20, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Toshikazu Masumoto, Hisatoshi Arita