Patents by Inventor Magarete Herbski

Magarete Herbski 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).

  • Thermochromic effect pigment and process for producing the same
    Patent number: 5690857
    Abstract: A thermochromic effect pigment comprising a thermochromic liquid crystal material encapsulated with a polymer and coated with one or more inorganic metal oxides or nearly insoluble metal salts selected from Al.sub.2 O.sub.3, SnO.sub.2, ZrO.sub.2, TiO.sub.2, CaO, SiO.sub.2, ZnO, MgO or BaSO.sub.4. The pigment is stable in solvent-based formulations and can be used as a colorant in the form of an aqueous suspension or as a powder in lacquer compositions, plastic compositions, dyed filter compositions, dyed glass compositions, dyed cosmetic compositions, printing ink compositions, and in hair coloring agents.
    Type: Grant
    Filed: June 7, 1994
    Date of Patent: November 25, 1997
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Karl Osterried, Magarete Herbski, Ian Charles Sage