Patents by Inventor Narutoshi Kazama

Narutoshi Kazama 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).

  • Lead frame for semiconductor device
    Patent number: 5221859
    Abstract: A lead frame of a plastic encapsulated type semiconductor device is provided with a coating film which has a solderability higher than a solderability of a basic metal of the lead frame, and the coating film has a corrosion potential higher than a corrosion potential of the basic metal. The coating film protects the basic metal from corrosion caused by the plastic encapsulated member. The coating film of the lead frame made of a Fe-Ni alloy is an alloy comprising metal selected from Mo, W, Au, Cr, Cu, metals of the platinum group and a metal selected from Fe, Co, and Ni.
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: June 22, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Shiro Kobayashi, Narutoshi Kazama, Masahiko Itoh, Noriyuki Ohnaka