Patents by Inventor Syozo Kikugawa

Syozo Kikugawa 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).

  • Disk type magnetic recording medium and process of manufacturing the same
    Patent number: 5635294
    Abstract: A magnetic recording medium and a manufacturing process thereof are disclosed. The medium comprises a magnetic layer containing a binder, chromium oxide having an average particle size within the range of 0.3 to 0.5 .mu.m and a metal magnetic powder, wherein the binder comprises a polyurethane resin having a polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --COOM, --PO (OM), and --OPO(OM).sub.2 wherein M represents a hydrogen atom or an alkali metal.
    Type: Grant
    Filed: May 10, 1993
    Date of Patent: June 3, 1997
    Assignee: Konica Corporation
    Inventors: Isamu Michihata, Hideki Murata, Katsuyuki Takeda, Nobuyuki Sekiguchi, Syozo Kikugawa