Patents by Inventor Naoki Imahashi

Naoki Imahashi 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).

  • Publication number: 20040142269
    Abstract: A carrier develops latent electrostatic images in corporation with a toner and one particle of the carrier includes a magnetic particle, and a coating layer covering the magnetic particle. The coating layer includes a crosslinked condensation product of a composition containing (i) an N-alkoxyalkylated polyamide and (ii) at least one resin that is reactive with the alkoxyalkylated polyamide and includes a silicone having a silanol group and/or a hydrolyzable group.
    Type: Application
    Filed: December 4, 2003
    Publication date: July 22, 2004
    Inventors: Akihiro Kotsugai, Kimitoshi Yamaguchi, Motoharu Tanaka, Naoki Imahashi, Hiroaki Takahashi
  • Patent number: 6735409
    Abstract: A process for developing which includes the step of developing a latent electrostatic image on a latent electrostatic image support by a developing agent supplied on a development sleeve, where the developing agent is supplied with a density of 1.3 g/cm3 to 2.0 g/cm3 at the closest part between the support and the sleeve, the support is contacted with magnetic brushes formed of the developing agent on the sleeve, so that the magnetic brushes have a width of 2 mm or less at a linearly contacting surface, in a direction where the surface rotates and the developing agent contains toners, and carriers having magnetic core particles and resin layers to cover its surface, the carriers have a weight average particle diameter of 25 &mgr;m to 45 &mgr;m, contain 60 wt % or more of the particles having a diameter of less than 44 &mgr;m, and 7 wt % or less of particles having a diameter of less than 22 &mgr;m.
    Type: Grant
    Filed: January 10, 2003
    Date of Patent: May 11, 2004
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Takahashi, Kimitoshi Yamaguchi, Naoki Imahashi, Akihiro Kotsugai
  • Publication number: 20030224279
    Abstract: A carrier for use with a toner as a two-component type developer for developing an electrostatic image, comprising spherical magnetic core particles, and a resin layer covering each of said core particles and containing at least two resistance controlling materials having different specific resistances, wherein each of the resistance controlling materials is in the form of particles having a number average particle diameter of no more than {fraction (1/10)} of a number average particle diameter of the toner.
    Type: Application
    Filed: March 21, 2003
    Publication date: December 4, 2003
    Inventors: Akihiro Kotsugai, Kimitoshi Yamaguchi, Naoki Imahashi, Hiroaki Takahashi
  • Publication number: 20030143000
    Abstract: A process for developing which includes the step of developing a latent electrostatic image on a latent electrostatic image support by a developing agent supplied on a development sleeve, where the developing agent is supplied with a density of 1.3 g/cm3 to 2.0 g/cm3 at the closest part between the support and the sleeve, the support is contacted with magnetic brushes formed of the developing agent on the sleeve, so that the magnetic brushes have a width of 2 mm or less at a linearly contacting surface, in a direction where the surface rotates and the developing agent contains toners, and carriers having magnetic core particles and resin layers to cover its surface, the carriers have a weight average particle diameter of 25 &mgr;m to 45 &mgr;m, contain 60 wt % or more of the particles having a diameter of less than 44 &mgr;m, and 7 wt % or less of particles having a diameter of less than 22 &mgr;m.
    Type: Application
    Filed: January 10, 2003
    Publication date: July 31, 2003
    Inventors: Hiroaki Takahashi, Kimitoshi Yamaguchi, Naoki Imahashi, Akihiro Kotsugai