Patents by Inventor Tomoyuki Shiraga

Tomoyuki Shiraga 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).

  • Pigment dispersion and ink composition and ink set both containing the same
    Patent number: 7524892
    Abstract: It is an object of the present invention to provide a pigment dispersion, an ink composition, and an ink set, enabling excellent glossiness, bronzing prevention, and ink composition storage stability to be realized. The present invention provides a pigment dispersion characterized by comprising at least a pigment, an aqueous medium, a copolymer resin between a hydrophobic monomer and a hydrophilic monomer, and a urethane resin, and also an ink composition characterized by containing at least the pigment dispersion and an aqueous medium, and an ink set characterized by comprising at least the ink composition.
    Type: Grant
    Filed: April 12, 2004
    Date of Patent: April 28, 2009
    Assignees: Seiko Epson Corporation, Mikuni Shikiso Kabushiki Kaisha
    Inventors: Shuichi Kataoka, Bunji Ishimoto, Akira Mizutani, Naoki Okamoto, Yoshiaki Miyazaki, Izumi Yasuda, Tomoyuki Shiraga
  • Pigment dispersion and ink composition and ink set both containing the same
    Publication number: 20050228069
    Abstract: It is an object of the present invention to provide a pigment dispersion, an ink composition, and an ink set, enabling excellent glossiness, bronzing prevention, and ink composition storage stability to be realized. The present invention provides a pigment dispersion characterized by comprising at least a pigment, an aqueous medium, a copolymer resin between a hydrophobic monomer and a hydrophilic monomer, and a urethane resin, and also an ink composition characterized by containing at least the pigment dispersion and an aqueous medium, and an ink set characterized by comprising at least the ink composition.
    Type: Application
    Filed: April 12, 2004
    Publication date: October 13, 2005
    Inventors: Shuichi Kataoka, Bunji Ishimoto, Akira Mizutani, Naoki Okamoto, Yoshiaki Miyazaki, Izumi Yasuda, Tomoyuki Shiraga