Patents by Inventor Eckhard Hilgenfeldt

Eckhard Hilgenfeldt 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).

  • Thickener combinations for building products
    Patent number: 5470383
    Abstract: The invention relates to thickener combinations for building products of nonionic cellulose ethers soluble in water or aqueous surfactant solutions and selected surfactants or naphthalenesulfonic acid condensation products.
    Type: Grant
    Filed: June 21, 1994
    Date of Patent: November 28, 1995
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Walter Schermann, Dennis Miller, Eckhard Hilgenfeldt, Jozef Bohme-Kovac
  • Anti-flooding agent for paints and plasters
    Patent number: 4414032
    Abstract: This invention relates to an agent for preventing the flooding of color pigments in aqueous plastic dispersion paints, plastic-based plasters, and distemper paints containing cellulose ethers, which is based on a block polymer in which a di- or polyamine is present as the initial molecule on which alkylene oxide units are added, said block polymer being obtained from one mole of a di- or polyamine of the general Formula I ##STR1## wherein R is an alkylene group with 2 to 6 carbon atoms, and x is a whole number from 1 to 4, by reaction with about 5 to 50 moles of ethylene oxide, followed by reaction with about 5 to 100 moles of propylene oxide.
    Type: Grant
    Filed: July 30, 1979
    Date of Patent: November 8, 1983
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Walter Schrattenholz, Eckhard Hilgenfeldt, Volker Knittel