Patents by Inventor Hilmar Franke

Hilmar Franke 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).

  • Polyimide waveguides as optical sensors
    Patent number: 5094517
    Abstract: The invention relates to a polyimide waveguide which is used as an optical sensor for the quantitative determination of liquids in the vapor phase, as well as for the determination of NH.sub.3, "NH.sub.4 OH", NO.sub.2 and N.sub.2 O.sub.5. The polyimide waveguide is composed of a cover layer, one or two layers of a polyamide-imide or a perfluorinated polyimide and a substrate.
    Type: Grant
    Filed: August 10, 1990
    Date of Patent: March 10, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Hilmar Franke
  • Hard ferrite powder and process for the preparation thereof
    Patent number: 4336242
    Abstract: A hard ferrite powder with the composition BaO.6Fe.sub.2 O.sub.3 composed of particles in the size range from about 1 to 10 microns and being easily separated into primary grains (monocrystal domains) which contain at least about 85% of primary grains with hexagonal lattice structures and sizes equal to or less than 0.5 micron.
    Type: Grant
    Filed: November 19, 1979
    Date of Patent: June 22, 1982
    Assignee: Dornier System GmbH.
    Inventors: Rainer Schmidberger, Hilmar Franke