Patents by Inventor Kouichi Kawasumi

Kouichi Kawasumi 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 recording medium
    Patent number: 4330600
    Abstract: A magnetic recording medium is disclosed in which dispersion characteristics of magnetizable particles in a magnetic paint is improved which results in improved saturation magnetic flux density and squareness ratio. The dispersion characteristics is improved by the treatment of magnetizable particle with a titanium alcoholate compound having at least one group easy to be hydrolyzed and at least one oleophilic group hard to be hydrolyzed in an organic solvent.
    Type: Grant
    Filed: October 8, 1980
    Date of Patent: May 18, 1982
    Assignee: Sony Corporation
    Inventors: Kouichi Kawasumi, Haruo Watanabe, Junetsu Seto