Patents by Inventor Patrick Den Boer

Patrick Den Boer 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).

  • Titanium dioxide suspension for use in film coating
    Patent number: 4693751
    Abstract: The invention is directed to a pigment suspension, for use in film coating, comprising titanium dioxide, xanthan gum, and an aqueous solvent. It was found that a pigment suspension comprising 30 percent titanium dioxide was obtainable that did not settle or harden for an extended period of time.
    Type: Grant
    Filed: February 7, 1986
    Date of Patent: September 15, 1987
    Assignee: Crompton & Knowles Corporation
    Inventors: Patrick Den Boer, Richard F. Heinze
  • Aqueous lake pigment suspension
    Patent number: 4652313
    Abstract: This invention relates to a pigment suspension usable for film coating tablets and the like, comprising lake pigment particles, a polymeric colloid, a viscosity lowering agent, which permits a higher concentration of pigment particles in the pigment suspension, and an aqueous solvent. A typical pigment suspension comprises a lake pigment, titanium dioxide, a natural gum, sodium tartrate, and water.
    Type: Grant
    Filed: October 24, 1984
    Date of Patent: March 24, 1987
    Assignee: Crompton and Knowles Corporation
    Inventors: Patrick Den Boer, Richard F. Heinze, Benjamin L. Meyers, Barendra C. Mallik