Patents by Inventor Isao Enjon

Isao Enjon 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).

  • Erasable ink composition
    Patent number: 7371785
    Abstract: An erasable ink composition comprising water, a water-soluble organic solvent, and the following colorant, colorless resin particles and shear-thinning, viscosity-adjustment agent, characterized in that the colorless resin particles have a mean particle diameter smaller than that of the colorant and are contained in an amount larger than that of the colorant: (a) 3 to wt % (based on the whole ink) of colorless resin particles which are made of at least one resin selected from among acrylic resins, urethane resins, silicone resins and melamine resins and have a mean particle diameter of 0.10 to 10 ?m, (b) 1 to 40 wt % (based on the whole ink) of a colorant having a mean particle diameter of 2 ?m or above, and (c) 0.01 to 4 wt % (based on the whole ink) of a shear thinning, viscosity-adjustment agent.
    Type: Grant
    Filed: February 14, 2003
    Date of Patent: May 13, 2008
    Assignee: Sakura Color Products Corporation
    Inventors: Yasuyuki Yoshimura, Norimasa Kurihara, Atsushi Sudo, Norihiro Hirano, Isao Enjon
  • Erasable ink composition
    Publication number: 20050143486
    Abstract: An erasable ink composition comprising water, a water-soluble organic solvent, and the following colorant, colorless resin particles and shear-thinning, viscosity-adjustment agent, characterized in that the colorless resin particles have a mean particle diameter smaller than that of the colorant and are contained in an amount larger than that of the colorant: (a) 3 to wt % (based on the whole ink) of colorless resin particles which are made of at least one resin selected from among acrylic resins, urethane resins, silicone resins and melamine resins and have a mean particle diameter of 0.10 to 10 ?m, (b) 1 to 40 wt % (based on the whole ink) of a colorant having a mean particle diameter of 2 ?m or above, and (c) 0.01 to 4 wt % (based on the whole ink) of a shear thinning, viscosity-adjustment agent.
    Type: Application
    Filed: February 14, 2003
    Publication date: June 30, 2005
    Applicant: SAKURA COLOR PRODUCTS CORPORATION
    Inventors: Yasuyuki Yoshimura, Norimasa Kurihara, Atsushi Sudo, Norihiro Hirano, Isao Enjon