Patents by Inventor Martin Ludke

Martin Ludke 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).

  • Thickening system for water-based building material mixes
    Patent number: 5234968
    Abstract: Thickening systems for water-based building material mixes, composed of 0.01 to 2% by weight of a water-soluble cellulose ether, 0.01 to 2% by weight of polyvinyl alcohol and 0.005 to 1% by weight of boric acid or salts thereof, the respective percentages being based on the dry substance content of the building material mix.Due to the addition of boric acid or borax, these thickening systems have an improved thickening action compared with thickening mixtures composed only of cellulose ether and polyvinyl alcohol.
    Type: Grant
    Filed: May 23, 1991
    Date of Patent: August 10, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Debus, Heinz-Josef Mann, Martin Ludke