Patents by Inventor Nagatoshi Koyayashi

Nagatoshi Koyayashi 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).

  • Modified crystalline monoazo lake pigment
    Patent number: 5055564
    Abstract: A monoazo lake pigment for use in inks and paints of the formula (I): ##STR1## whose X-ray diffraction pattern shows a high diffraction intensity at a diffraction angle (2.theta..+-.0.2.degree.; Cu-K.sub..alpha.) of 5.0.degree., moderate diffraction intensity at 25.0.degree. and relatively low diffraction intensities at 14.8.degree., 19.5.degree..
    Type: Grant
    Filed: September 15, 1988
    Date of Patent: October 8, 1991
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Nagatoshi Koyayashi, Hirohito Ando