Patents by Inventor Katsunori Ohwada

Katsunori Ohwada 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).

  • Magnetoresistive head structure that prevents under film from undesirable etching
    Patent number: 5371643
    Abstract: A magnetoresistive head is fabricated with a high yield rate by preventing the electrode film from breaking down. An upper shield film is formed with an electrode separation layer and an upper gap film disposed between it and the electrode film. The electrode film is prevented from being etched when the upper shield film is subjected to ion milling as a result. Further, the upper gap film is laid on top of the electrode separation layer, and a lead is satisfactorily protected and prevented from being exposed. Thus, the upper shield film and the lead are prevented from becoming short-circuited as a result of the disconnection of the electrode film and the exposure of the lead.
    Type: Grant
    Filed: August 11, 1992
    Date of Patent: December 6, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Isamu Yuito, Makoto Morijiri, Tooru Takeura, Katsunori Ohwada, Masahiro Kitada