Patents by Inventor Wada Toshiaki

Wada Toshiaki 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).

  • Patent number: 5181151
    Abstract: A thin-film perpendicular magnetic recording and reproducing head including a magnetic member defining a return path and having a narrow groove formed in one of its principal surfaces in parallel to a sliding surface adapted to face a magnetic recording medium, a non-magnetic material filling the groove, and a multilayer film assembly formed above the groove and consisting at least of a thin-film conductor coil, an interlayer insulating film, a thick main pole film, a main pole film and a protective film formed one upon another. The magnetic member is connected to the main pole film through a via hole portion, and is exposed on the sliding surface in the vicinity of the main pole film so as to face the recording medium. A thin magnetic film serving as a magnetic shield covers the protective film and the sidewall surface of the head and is joined to the sidewall surface of the magnetic member.
    Type: Grant
    Filed: April 16, 1991
    Date of Patent: January 19, 1993
    Assignees: Sumitomo Special Metals Co., Ltd., Denki Kagaku Dogyo Kabushiki Kaisha
    Inventors: Masami Yamashita, Noboru Iwato, Hideki Mine, Wada Toshiaki