Patents by Inventor Andreas Warzecha

Andreas Warzecha 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).

  • Method for producing isocyanates
    Patent number: 8193385
    Abstract: The invention relates to a multistage process for the continuous preparation of organic, distillable isocyanates, preferably diisocyanates, particularly preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic amines with urea and alcohols to liberate ammonia and form low molecular weight monomeric urethanes and thermal dissociation of the latter, in which by-products formed are at least partly utilized.
    Type: Grant
    Filed: August 8, 2007
    Date of Patent: June 5, 2012
    Assignee: BASF SE
    Inventors: Matthias Kloetzer, Heinrich-Josef Blankertz, Gunter Georgi, Eckhard Stroefer, Volker Krase, Gerhard Schulz, Andreas Warzecha