Patents by Inventor Uta Hillgärtner

Uta Hillgärtner 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).

  • Colouring using pearlescent pigments in the food and pharmaceutical sectors
    Publication number: 20110129506
    Abstract: The present invention relates to the use of titanium dioxide pigments and/or iron oxide pigments based on platy substrates for colouring food products and pharmaceutical products.
    Type: Application
    Filed: November 22, 2010
    Publication date: June 2, 2011
    Inventors: Ralf SCHWEINFURTH, Uta Hillgärtner
  • Pigment mixture comprising BiOCI pigments
    Patent number: 6743285
    Abstract: The present invention relates to pigment mixtures in the form of a dispersion or powder, consisting of at least two components, where component A comprises coated or uncoated BiOCl pigments in the form of a powder or dispersion, and component B comprises pearlescent pigments, platelet-shaped, needle-shaped or spherical colorants and/or fillers, and to the use thereof in paints, coatings, printing inks, plastics, powder coatings, plastic films, for the finishing of seed and in particular in cosmetic formulations.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: June 1, 2004
    Assignee: Merck Patent GmbH
    Inventors: Ralf Anselmann, Uta Hillgärtner, Sabine Schoen
  • Highly light-scattering pigment mixture
    Patent number: 6648958
    Abstract: Highly light-scattering pigment mixture featuring (i) 70-99.9% by weight of a component A consisting of spherical silicon dioxide with a diameter of less than 50 &mgr;m, coated with titanium dioxide and optionally a further layer of SiO2, and (ii) 0.1-30% by weight of a component B consisting of spherical silicon dioxide with a diameter of less than 50 &mgr;m, coated with titanium dioxide as a first layer and iron(III) oxide as a second, outer layer, the refractive index of the pigment being adjusted to a value of between 1.45 and 1.65.
    Type: Grant
    Filed: November 13, 2002
    Date of Patent: November 18, 2003
    Assignee: Merck Patent Gesellschaft
    Inventors: Ralf Anselmann, Martin Knapp, Uta Hillgärtner