Patents by Inventor Ishiwata Nobuyuki

Ishiwata Nobuyuki 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).

  • Magneto-resistance effect type composite head and production method thereof
    Patent number: 6639766
    Abstract: A magneto-resistance effect (“MR”) type composite head includes a reproduction head with an MR element arranged between a first and a second magnetic shield; and a recording head arranged adjacent to the reproduction head so as to use the second magnetic shield as a first magnetic pole film and having a second magnetic pole film opposing to the first magnetic pole via a magnetic gap; the MR element includes a center region including a ferromagnetic tunnel junction magneto-resistance effect film having a first ferromagnetic layer and a second ferromagnetic layer for generating a magneto-resistance effect using the first and the second magnetic shields as electrodes so that a current flows in an almost vertical direction between the first and the second magnetic shields; a tunnel barrier layer provided between the first and the second ferromagnetic layer; and an end region arranged to sandwich the center region from both sides for /applying a bias magnetic field to the center region.
    Type: Grant
    Filed: October 24, 2001
    Date of Patent: October 28, 2003
    Assignee: NEC Corporation
    Inventors: Ishiwata Nobuyuki, Hisanao Tsuge, Hisao Matsutera, Yuji Tsukamoto, Masafumi Nakada, Atsushi Kamijo
  • Magneto-resistance effect type composite head and production method thereof
    Patent number: 6333842
    Abstract: The present invention provides a magneto-resistance effect (hereinafter, referred to as MR) type composite head.
    Type: Grant
    Filed: December 3, 1998
    Date of Patent: December 25, 2001
    Assignee: NEC Corporation
    Inventors: Ishiwata Nobuyuki, Hisanao Tsuge, Hisao Matsutera, Yuji Tsukamoto, Masafumi Nakada, Atsushi Kamijo