Patents by Inventor Sohko Ito

Sohko Ito 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).

  • Aqueous pigment dispersion water-base ink composition and recording method using the ink composition
    Patent number: 6488753
    Abstract: Disclosed are an aqueous pigment dispersion and an ink composition which can realize high print density. The aqueous pigment dispersion comprises at least water and a surface-modified carbon black, the surface-modified carbon black being dispersible and/or dissolvable in water without any dispersant and having a hydrophilic functional group content/specific surface area value of 5 to 30 &mgr;mol/m2.
    Type: Grant
    Filed: March 9, 2000
    Date of Patent: December 3, 2002
    Assignees: Seiko Epson Corporation, Orient Chemical Industries, Ltd.
    Inventors: Hiroshi Ito, Masayuki Momose, Hiroko Hayashi, Sohko Ito