Patents by Inventor Katsumi Nagayasu

Katsumi Nagayasu 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, a process for preparing a magnetic recording medium and a binder composition therefor
    Patent number: 4686145
    Abstract: A novel magnetic recording medium consisting of a base material, magnetic particles and a specific polyurethane-based binder containing incorporated sulphonate groups, a process for preparing such a magnetic recording medium which comprises coating a base material with a coating material comprising (i) an organic solvent, (ii) a polyurethane binder containing chemically incorporated sulphonate groups and (iii) magnetic particles and the most preferred binder composition therefor comprising a hexandiol-(1,6)-polycarbonate-based polyurethane.
    Type: Grant
    Filed: February 19, 1986
    Date of Patent: August 11, 1987
    Assignee: Sumitomo Bayer Urethane Co., Ltd.
    Inventors: Masaru Honda, Takanori Chiba, Toshiaki Imokawa, Yoshito Harada, Katsumi Nagayasu