Patents by Inventor Shingo Uzukawa

Shingo Uzukawa 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).

  • Patent number: 5203913
    Abstract: The invention provides an erasable aqueous ink composition comprising, based on the total weight of the ink composition, 3 to 50% of a resin having a minimum film-forming temperature of not lower than 40.degree. C., 0.01 to 10% of a water-insoluble dye, 0.5 to 50% of a water-soluble organic solvent and 20 to 60% of water.
    Type: Grant
    Filed: October 11, 1991
    Date of Patent: April 20, 1993
    Assignee: Sakura Color Products Corporation
    Inventors: Hiroyoshi Yamamoto, Shingo Uzukawa
  • Patent number: 5120359
    Abstract: The present invention provides:(1) an ink composition erasable with a rubber eraser, the composition comprising 1 to 50% of a pigment, 3 to 50% of a resin having a film-forming temperature of 40.degree. C. or higher, 0.5 to 50% of an organic solvent and 7 to 60% of water, based on the weight of the ink composition;(2) an ink composition erasable with a rubber eraser, the composition comprising 2 to 90% of a pigment coated with a resin having a film-forming temperature of 40.degree. C. or higher, 0.5 to 30% of an organic solvent and 0.5 to 30% of water, based on the weight of the ink composition; and(3) an ink composition erasable with a rubber eraser, the composition comprising 2 to 90% of a pigment coated with a resin having a film-forming temperature of 40.degree. C. or higher, 1.5 to 55% of an emulsion (calculated as solids), 0.5 to 30% of an organic solvent and 4.0 to 60% of water, based on the weight of the ink composition.
    Type: Grant
    Filed: October 26, 1989
    Date of Patent: June 9, 1992
    Assignee: Sakura Color Products Corporation
    Inventors: Shingo Uzukawa, Yukito Shoji