Patents by Inventor Hirotoshi Yonekawa

Hirotoshi Yonekawa 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).

  • Light color emulsion ink for stencil printing, and method of stencil printing
    Patent number: 6632272
    Abstract: A light color W/O emulsion ink for stencil printing, includes chromatic pigment in an amount not smaller than 0.1% and smaller than 1% by weight of the total weight of the ink and white pigment in an amount not smaller than 7% and not larger than 20% by weight of the total weight of the ink.
    Type: Grant
    Filed: August 2, 2001
    Date of Patent: October 14, 2003
    Assignee: Riso Kagaku Corporation
    Inventors: Yoshihiro Hayashi, Hirotoshi Yonekawa
  • Color emulsion ink for stencil printing
    Patent number: 6632273
    Abstract: A color W/O emulsion ink for stencil printing includes a plurality of kinds of chromatic pigments different from each other in hue. The total amount of the chromatic pigments is not smaller than 1% by weight and not larger than 10% by weight of the total weight of the ink. The content of at least one of the chromatic pigments is smaller than 1% by weight and at least one of the chromatic pigments the content of which is smaller than 1% by weight is a specific pigment selected from the group consisting of anthraquinone series pigments, perinone.perylene series pigments, phthalocyanine series pigments, dioxazine series pigments, quinacridone series pigments and isoindolinone series pigments.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: October 14, 2003
    Assignee: Riso Kagaku Corporation
    Inventors: Yoshihiro Hayashi, Hirotoshi Yonekawa
  • Color emulsion ink for stencil printing
    Publication number: 20020043176
    Abstract: A color W/O emulsion ink for stencil printing includes a plurality of kinds of chromatic pigments different from each other in hue. The total amount of the chromatic pigments is not smaller than 1% by weight and not larger than 10% by weight of the total weight of the ink. The content of at least one of the chromatic pigments is smaller than 1% by weight and at least one of the chromatic pigments the content of which is smaller than 1% by weight is a specific pigment selected from the group consisting of anthraquinone series pigments, perinone perylene series pigments, phthalocyanine series pigments, dioxazine series pigments, quinacridone series pigments and isoindolinone series pigments.
    Type: Application
    Filed: August 29, 2001
    Publication date: April 18, 2002
    Inventors: Yoshihiro Hayashi, Hirotoshi Yonekawa
  • Light color emulsion ink for stencil printing, and method of stencil printing
    Publication number: 20020033115
    Abstract: A light color W/O emulsion ink for stencil printing, includes chromatic pigment in an amount not smaller than 0.1% and smaller than 1% by weight of the total weight of the ink and white pigment in an amount not smaller than 7% and not larger than 20% by weight of the total weight of the ink.
    Type: Application
    Filed: August 2, 2001
    Publication date: March 21, 2002
    Inventors: Yoshihiro Hayashi, Hirotoshi Yonekawa