Patents by Inventor Tadamitsu Hirata

Tadamitsu Hirata 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: 5621023
    Abstract: To produce colored particles with a 10-200 .mu.m average grain size simply, efficiently, and in high yields, in order to obtain suede-type paint constituents with excellent decorative features capable of producing finely detailed, marble-like, multi-color patterns. Water-insoluble particles and a polyvalent carboxylic acid resin with an acid value (solid-based) of about 20-120, either water-soluble or water-diffusing, are mixed in water; and after primary coated particles are formed on the surfaces of the water-insoluble particles on which the polyvalent carboxylic acid resin is adsorbed, a dispersion-stabilized emulsion resin containing a colored pigment is mixed in the dispersion liquid; and a metal salt is added to this mixture so that colored particles with an average particle size of about 10-200 .mu.m with a surface colored coating are obtained. The water-insoluble particles can be either synthetic resin particles or inorganic particles.
    Type: Grant
    Filed: December 9, 1994
    Date of Patent: April 15, 1997
    Assignee: Asahipen Corporation
    Inventors: Yoshihiko Nishimura, Tadamitsu Hirata
  • Patent number: 5106889
    Abstract: A dispersion of a colored high-molecular weight particulate material is prepared by a) mixing a pigment with an aqueous emulsion of a resin to form a dispersion of the pigment within the emulsion; b) combining the dispersion with particles of polyvinyl chloride containing a plasticizer to form a mixture; and c) adding a metal salt to the mixture to cause the resin to coagulate onto the particles of the polyvinyl chloride. A film comprising the resin and the pigment is formed on the particles of the polyvinyl chloride.
    Type: Grant
    Filed: August 16, 1990
    Date of Patent: April 21, 1992
    Assignee: Asahipen Corporation
    Inventors: Tadamitsu Hirata, Yoshihiko Nishimura