Patents by Inventor Brigitte Helmreich

Brigitte Helmreich 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).

  • Heteroaromatic polyether
    Patent number: 5300625
    Abstract: Polyethers which contain recurring units of the formula I ##STR1## in which A is a divalent aryl or heteroaryl radical,X is O, S or NR,Z is a divalent aryl or heteroaryl radical or an alkynyl, azo or (CF.sub.2) group, andR is arylare synthesized. The polyethers can be used as thermoplastics for the production of injection-molded articles, extrudates, polymer blends and coatings and for the production of films and membranes from solution.
    Type: Grant
    Filed: January 10, 1992
    Date of Patent: April 5, 1994
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Brigitte Helmreich, Klaus Burger, Gerhard Maier, Reinhold Hecht, Oskar Nuyken