Patents by Inventor Hiroko Itamochi

Hiroko Itamochi 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 paint and process for producing the same
    Patent number: 5525649
    Abstract: Disclosed herein in are a magnetic paint composed of a kneaded composition comprising fine magnetic iron based alloy particles, acicular fine magnetic iron oxide particles or plate-like fine magnetic ferrite particles, a binder resin and an organic solvent, the solid content of the fine magnetic iron based alloy particles, the acicular fine magnetic iron oxide particles or plate-like fine magnetic ferrite particles and the binder resin in the kneaded composition being from 65 to 85% by weight, the binder resin being from 5 to 30% by weight based on the fine magnetic iron based alloy particles, the acicular fine magnetic iron oxide particles or plate-like fine magnetic ferrite particles, and a gloss at 45.degree. after dispersion for 6 hours being not less than 120% when formed into a coating film; and a method of preparing the same.
    Type: Grant
    Filed: May 17, 1995
    Date of Patent: June 11, 1996
    Assignee: Toda Kogyo Corp.
    Inventors: Akihiro Nishimura, Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka, Hiroko Itamochi
  • Magnetic iron oxide particles
    Patent number: 5124207
    Abstract: Disclosed herein is a magnetic iron oxide particle comprising a magnetic iron oxide core particle containing ferrous iron, a Zn compound layer as a lower coating layer on the surface of said core particle, and an Si compound layer as an upper coating layer thereon.
    Type: Grant
    Filed: April 10, 1990
    Date of Patent: June 23, 1992
    Assignee: Toda Kogyo Corp.
    Inventors: Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka, Hiroko Itamochi
  • Magnetic recording medium comprising magnetic particles and a polyester resin having an iminosulfonyl group
    Patent number: 5061570
    Abstract: A magnetic recording medium comprising a substrate, and a magnetic recording layer composed of a coating composition containing a binder resin and magnetic particles, the binder resin being a polyester having an iminosulfonyl group, is disclosed. The magnetic recording medium has excellent magnetic characteristics.
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: October 29, 1991
    Assignee: Toda Kogyo Corp.
    Inventors: Akihiro Nishimura, Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka, Hiroko Itamochi