Patents by Inventor Hiroto Saguchi

Hiroto Saguchi 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: 4423114
    Abstract: A magnetic powder for a magnetic recording medium which is a cobalt-adsorbed magnetic iron oxide having a coercive force of 1000 Oe or more and a ratio of a coercive force at -196.degree. C. to a coercive force at room temperature of 3 or less.
    Type: Grant
    Filed: September 9, 1981
    Date of Patent: December 27, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Hiroto Saguchi, Masashi Hayama, Keitaro Sakai
  • Magnetic recording medium having cobalt adsorbed iron oxide layer
    Patent number: 4420537
    Abstract: A magnetic recording medium comprises a substrate coated with a magnetic composition comprising a cobalt adsorbed iron oxide powder with a phosphoric ester type anionic surfactant at a ratio of 2 wt. % or more and a binder at a ratio of said iron oxide powder to said binder of 4 or more.A magnetic recording medium has a coercive force Hc of 950 to 1200 Oe and a residual magnetic flux .phi..sub.r of 0.35 to 0.6 maxwell.
    Type: Grant
    Filed: November 25, 1980
    Date of Patent: December 13, 1983
    Assignee: TDK Electronics Co. Ltd.
    Inventors: Masashi Hayama, Hiroto Saguchi, Kenji Hirabayashi