Patents by Inventor Seiji Kamamasu

Seiji Kamamasu 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-dispersed aqueous recording liquid and printed material
    Patent number: 7348368
    Abstract: A pigment-dispersed aqueous recording liquid containing at least a pigment and a resin, which comprises from 60 to 200 parts by weight of the resin to 100 parts by weight of the pigment, wherein at least one of the resin is a water-dispersible urethane type resin, a weight fraction of a polyurethane urea part of which is at most 2.0 wt % to the urethane resin, and the pigment dispersed in the recording liquid has a dispersion particle size D50 of from 40 to 100 nm.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: March 25, 2008
    Assignees: Mitsubishi Chemical Corporation, Seiko Epson Corporation, Mikuni Shikiso Kabushiki Kaisha
    Inventors: Munetaka Kakiuchi, Shuichi Kataoka, Takashi Oyanagi, Kimihiko Ohya, Seiji Kamamasu
  • Pigment-dispersed aqueous recording liquid and printed material
    Publication number: 20040229976
    Abstract: A pigment-dispersed aqueous recording liquid containing at least a pigment and a resin, which comprises from 60 to 200 parts by weight of the resin to 100 parts by weight of the pigment, wherein at least one of the resin is a water-dispersible urethane type resin, a weight fraction of a polyurethane urea part of which is at most 2.0 wt % to the urethane resin, and the pigment dispersed in the recording liquid has a dispersion particle size D50 of from 40 to 100 nm.
    Type: Application
    Filed: March 3, 2004
    Publication date: November 18, 2004
    Applicants: Seiko Epson Corporation, Mitsubishi Chemical Corporation, MIKUNI SHIKISO KABUSHIKI KAISHA
    Inventors: Munetaka Kakiuchi, Shuichi Kataoka, Takashi Oyanagi, Kimihiko Ohya, Seiji Kamamasu