Patents by Inventor John Francis Engelbrecht

John Francis Engelbrecht 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).

  • Vesiculated polymer particles
    Patent number: 7572846
    Abstract: Vesiculated polymer particles and a method of manufacture thereof, are suitable for the beneficial replacement of titanium dioxide pigments and extenders amongst others, and have improved opacity, whiteness, scrub resistance and water resistance due. The manufacturing process exhibits effective control of particle size and particle size distribution.
    Type: Grant
    Filed: September 23, 2003
    Date of Patent: August 11, 2009
    Assignee: Freeworld Coatings Capital
    Inventors: John Francis Engelbrecht, Deon De Wet-Roos, Albertus Christiaan Smit, Boyd Cooray