Patents by Inventor Hiroomi Kakihara

Hiroomi Kakihara 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 carrier
    Patent number: 6506531
    Abstract: A magnetic carrier exhibiting excellent durability against mechanical impact as exerted by vibration and capable of exhibiting a stable charging performance in electrophotography is provided.
    Type: Grant
    Filed: November 5, 1999
    Date of Patent: January 14, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiyuki Hakata, Hiroomi Kakihara, Masaaki Fukugauchi, Kenji Okada, Yushi Mikuriya, Kazumi Yoshizaki
  • Magnetic carrier for electrophotography
    Patent number: 5654120
    Abstract: The disclosure describes a magnetic carrier for electrophotography having a number-average particle diameter of 1 to 1000 .mu.m, and comprising ferromagnetic iron compound particles, non-magnetic metal oxide particles and a phenol-based resin as a binder resin, the total amount of said ferromagnetic iron compound particles and said non-magnetic metal oxide particles being 80 to 99 wt %, and the ratio of the number-average particle diameter of said non-magnetic metal oxide particles and the number-average particle diameter of said ferromagnetic iron compound particles being more than 1.0.
    Type: Grant
    Filed: October 4, 1995
    Date of Patent: August 5, 1997
    Assignee: Toda Kogyo Corporation
    Inventors: Toshiyuki Hakata, Hiroomi Kakihara, Masaaki Fukugauchi