Patents by Inventor Kyouko Takashima

Kyouko Takashima 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).

  • Water-based pigment dispersion for ink-jet recording, ink composition for ink-jet recording and method of producing the same
    Patent number: 7691193
    Abstract: Disclosed are an aqueous pigment dispersion for inkjet ink, a method for producing the same, and an ink composition for inkjet recording which mainly contains the aqueous pigment dispersion for inkjet ink. The method for producing the aqueous pigment dispersion for inkjet ink is characterized by comprising a kneading step wherein a mixture including a styrene resin, a quinacridone pigment, a phthalimidomethylated quinacridone compound, an alkali metal hydroxide and a wetting agent is kneaded for producing a solid colored kneaded material, and a dispersing step wherein the thus-obtained solid colored kneaded material is dispersed into an aqueous medium.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: April 6, 2010
    Assignee: Dainippon Ink & Chemicals, Inc.
    Inventors: Shinichi Okada, Kyouko Takashima, Ryouta Hibino
  • Water-based pigment dispersion for ink-jet recording, ink composition for ink-jet recording and method of producing the same
    Publication number: 20060235106
    Abstract: Disclosed are an aqueous pigment dispersion for inkjet ink, a method for producing the same, and an ink composition for inkjet recording which mainly contains the aqueous pigment dispersion for inkjet ink. The method for producing the aqueous pigment dispersion for inkjet ink is characterized by comprising a kneading step wherein a mixture including a styrene resin, a quinacridone pigment, a phthalimidomethylated quinacridone compound, an alkali metal hydroxide and a wetting agent is kneaded for producing a solid colored kneaded material, and a dispersing step wherein the thus-obtained solid colored kneaded material is dispersed into an aqueous medium.
    Type: Application
    Filed: July 29, 2004
    Publication date: October 19, 2006
    Applicant: DAINIPPON INK AND CHEMICALS, INC
    Inventors: Shinichi Okada, Kyouko Takashima, Ryouta Hibino