Patents by Inventor Wan P. Hsu

Wan P. Hsu 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).

  • Synthetic, monodispersed color pigments for the coloration of media such as printing inks, and method and apparatus for making same
    Patent number: 5344489
    Abstract: A method of making synthetic color pigments comprises synthesizing monodispersed colloidal core particles by precipitation from a solution and applying dye material to the core particles either by adsorption directly into the core particles or by adsorption or incorporation into alumina fixation shells at the surfaces of the core particles. Additional functional shells may be applied to the dyed core particles for various reasons. The pigments are useful for the coloration of various media such as printing inks and paint compositions.
    Type: Grant
    Filed: November 15, 1991
    Date of Patent: September 6, 1994
    Assignee: Manfred R. Kuehnle
    Inventors: Egon Matijevic, Wan P. Hsu, Manfred R. Kuehnle
  • Synthetic, monodispersed color pigments for the coloration of media such as printing inks, and method and apparatus for making same
    Patent number: 5318628
    Abstract: A method of making synthetic color pigments comprises synthesizing monodispersed colloidal core particles by precipitation from a solution and applying dye material to the core particles either by adsorption directly into the core particles or by adsorption or incorporation into alumina fixation shells at the surfaces of the core particles. Additional functional shells may be applied to the dyed core particles for various reasons. The pigments are useful for the coloration of various media such as printing inks and paint compositions.
    Type: Grant
    Filed: December 4, 1992
    Date of Patent: June 7, 1994
    Assignee: Manfred R. Kuehnle
    Inventors: Egon Matijevic, Wan P. Hsu, Manfred R. Kuehnle