Patents by Inventor Shigehisa Harada

Shigehisa Harada 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).

  • Method of making a magnetic powder
    Patent number: 4214893
    Abstract: A method is provided for making a magnetic powder composed principally of cobalt from a mixture solution containing metal salts, such as cobalt salt, and the like, catalysts, such as palladium chloride, and the like, and reducing agents, such as sodium hypophosphite, and the like. Protein, such as albumin or hemoglobin, is added to the mixture solution to promote dispersion of cobalt particles therein. The magnetic powder thus obtained is suitable for use in the production of audio and video tapes.
    Type: Grant
    Filed: November 7, 1977
    Date of Patent: July 29, 1980
    Assignee: Nippon Columbia Kabushikikaisha
    Inventors: Kunihiro Tsuganezawa, Teruo Kobayashi, Shigehisa Harada, Yoichi Nishizawa, Tomoya Kusunose