Patents by Inventor Yamagata, deceased, Koji

Yamagata, deceased, Koji 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).

  • Compound magnetic head having a recording head and a reproducing magnetoresitive head integrated therein
    Patent number: 5079662
    Abstract: A compound magnetic head includes first and second magnetic poles arranged to face each other to define a recording gap therebetween, a magnetic film arranged between the first and second magnetic poles, a first non-magnetic film arranged between the first magnetic pole and the magnetic film to define a first reproducing gap therebetween, and a second non-magnetic film arranged between the second magnetic pole and the magnetic pole to define a second reproducing gap therebetween. The recording gap and the first and second reproducing gaps have the same width and a common center line of the gap widths parallel to the direction of movement of a magnetic recording medium.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: January 7, 1992
    Assignee: Hitachi, Ltd.
    Inventors: Kanji Kawakami, Yokuo Saitoh, Tetsuo Kobayashi, Takayoshi Ohtsu, Hiroshi Fukui, Yamagata, deceased, Koji, by Tetsuji Yamagata, legal representative, by Reiko Yamagata, legal representative