Patents by Inventor Hideki Hotsuki

Hideki Hotsuki 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: 4670337
    Abstract: In a magnetic recording medium comprising a base and a magnetic coating layer formed thereon which consists of ferromagnetic particles dispersed in a binder, the magnetic layer contains from 3 to 15 percent by weight, on the basis of the magnetic powder weight, of abrasive particles having a Mohs hardness of 6 or upward, in such a manner that the average number of the abrasive particles per unit area of the magnetic layer surface is at least 0.25 per square micron. The magnetic powder is a magnetic metal powder based on iron, and the abrasive particles are angular rather than granular in shape.
    Type: Grant
    Filed: July 29, 1985
    Date of Patent: June 2, 1987
    Assignee: TDK Corporation
    Inventors: Yasumichi Tokuoka, Hitoshi Arai, Norio Higuchi, Hideki Hotsuki
  • Leader tape
    Patent number: 4422119
    Abstract: A leader tape for magnetic recording tape, characterized in that a coating film, consisting of a polymeric binder, an inorganic powder having a Mohs' hardness of 5 or above in an amount of not more than 5% by weight on the basis of the binder weight, and an antistatic agent, is formed on a plastic base.
    Type: Grant
    Filed: July 22, 1981
    Date of Patent: December 20, 1983
    Inventors: Yoshio Kawakami, Masatoshi Okamura, Haruo Shiba, Hideki Hotsuki