Patents by Inventor Yasuo Imaoka

Yasuo Imaoka 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).

  • Magnetic powder for magnetic recording medium
    Patent number: 4321303
    Abstract: A magnetic powder for a magnetic recording medium is obtained by forming a silica layer on a surface of an acicular iron oxide fine powder as a core by treating it with a silicon compound before preparing a cobalt modified acicular iron oxide fine powder by dispersing said acicular iron oxide fine powder as the core in an aqueous solution of ammonia containing cobalt ion and treating it in an inert gas atmosphere at high temperature or in a reduction atmosphere.
    Type: Grant
    Filed: July 30, 1980
    Date of Patent: March 23, 1982
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Haruyuki Morita, Yuichi Kubota, Yasuo Imaoka