Patents by Inventor Naoki Matsushige

Naoki Matsushige 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).

  • Developer in an image forming device having a binding resin and magnetic powder
    Patent number: 5014089
    Abstract: A developer for developing electrostatic images, containing a magnetic toner having a binder resin and magnetic powder, the developer containing 17-60% by number of magnetic toner particles of 5 microns or smaller, containing 1-23% by number of magnetic toner particles of 8-12.7 microns, and containing 2.0% by volume or less of magnetic toner particles of 16 microns or larger; wherein the magnetic toner has a volume-average particle size of 4-9 microns, and the magnetic toner particles of 5 microns or smaller have a particle size distribution satisfying the following:N/V=-0.04N+k,wherein N denotes % by number of magnetic toner particles of 5 micron or smaller, V denotes % by volume of magnetic toner particles of 5 microns or smaller, k denotes a positive number of 4.5-6.5, and N denotes a positive number of 17-60.
    Type: Grant
    Filed: May 25, 1990
    Date of Patent: May 7, 1991
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kiichiro Sakashita, Toshiaki Nakahara, Hirohide Tanikawa, Naoki Matsushige, Satoshi Yoshida, Masatsugu Fujiwara, Yasuo Mitsuhashi
  • Non-magnetic toner
    Patent number: 4985327
    Abstract: A developer for developing electrostatic images, comprising a non-magnetic toner, the toner containing 17-60% by number of non-magnetic toner particles of 5 microns or smaller, containing 1-30% by number of non-magnetic toner particles of 8-12.7 microns, and containing 2.0% by volume or less of nonmagnetic toner particles of 16 microns or larger; wherein the non-magnetic toner has a volume-average particle size of 4-10 microns, and the non-magnetic toner particles of 5 microns or smaller have a particle size distribution satisfying the following formula:N/V=-0.04N+k,wherein N denotes % by number of non-magnetic toner particles of 5 microns of smaller, V denotes % by volume of non-magnetic toner particles of 5 microns or smaller k denotes a positive number of 4.5-6.5, and N denotes a positive number of 17-60.
    Type: Grant
    Filed: May 22, 1990
    Date of Patent: January 15, 1991
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kiichiro Sakashita, Hirohide Tanikawa, Satoshi Yoshida, Toshiaki Nakahara, Naoki Matsushige, Masatsugu Fujiwara, Yasuo Mitsuhashi
  • Developer and image forming device
    Patent number: 4957840
    Abstract: A developer for developing electrostatic images, comprising a magnetic toner comprising a binder resin and magnetic powder, the developer containing 17-60% by number of magnetic toner particles of 5 microns or smaller, containing 1-23% by number of magnetic toner particles of 8-12.7 microns, and containing 2.0% by volume or less of magnetic toner particles of 16 microns or larger; wherein the magnetic toner has a volume-average particle size of 4-9 microns, and the magnetic toner particles of 5 microns or smaller have a particle size distribution satisfying the following formula:N/V=-0.04N+k,wherein N denotes % by number of magnetic toner particles of 5 micron or smaller, V denotes % by volume of magnetic toner particles of 5 microns or smaller, k denotes a positive number of 4.5-6.5, and N denotes a positive number of 17-60.
    Type: Grant
    Filed: October 25, 1988
    Date of Patent: September 18, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kiichiro Sakashita, Toshiaki Nakahara, Hirohide Tanikawa, Naoki Matsushige, Satoshi Yoshida, Masatsugu Fujiwara, Yasuo Mitsuhashi