Patents by Inventor Andreas Gröschl

Andreas Gröschl 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).

  • Continuous process for the preparation of diaminodicyclohexylmethane
    Patent number: 6504060
    Abstract: The invention relates to a process for the preparation of diaminodicyclohexylmethane (“PACM”) with a proportion of trans,trans-4,4′-diaminodicyclohexylmethane of from 17 to 24% by hydrogenation of diaminodiphenylmethane (“MDA”) in the presence of a pulverulent catalyst in a continuously operated suspension reactor at a conversion of MDA of at least 95%, based on the amount of MDA used.
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: January 7, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Bunnenberg, Andreas Gröschl, Michael Holzbrecher, Andreas Schulze Tilling
  • Surface-cleaning method
    Patent number: 6387189
    Abstract: A method of cleaning surfaces made of glass, graphite, ceramics, polymeric and metallic materials, synthetic and vegetable fibres, e.g. fabrics, textiles or waste paper, in particular membrane surfaces, by detaching or dissolving organic and inorganic soilings by a simple flushing operation, where a solution of an iminocarboxylic acid, a polyamino acid, an emulsifier or a mixture thereof is used.
    Type: Grant
    Filed: March 30, 1999
    Date of Patent: May 14, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Andreas Gröschl, Torsten Groth, Volker Hassmann, Jürgen Horn, Ingo Janisch, Winfried Joentgen, Bernhard Lehmann, Wolfgang Zarges
  • Inhibition and delay of deposit formation in membrane processes
    Patent number: 6187195
    Abstract: The invention relates to the use of polyaspartic acids and their mixtures with surfactants and emulsifiers for inhibiting or delaying deposit formation by sparingly soluble organic and inorganic components in the feed of a process that uses a membrane.
    Type: Grant
    Filed: May 10, 1999
    Date of Patent: February 13, 2001
    Assignee: Bayer AG
    Inventors: Wolfgang Zarges, Torsten Groth, Winfried Joentgen, Andreas Gröschl