Patents by Inventor Dierk Röhrig

Dierk Röhrig 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).

  • Dye mixtures comprising water-soluble fiber-reactive azo dyes, preparation thereof and use thereof
    Patent number: 6228131
    Abstract: Dye mixtures comprising water-soluble fiber-reactive azo dyes, preparation thereof and use thereof Described are dye mixtures comprising yellow dyes of the formulae indicated and defined in claim 1, which are useful for dyeing hydroxyl- and/or carboxamido-containing material, especially fiber material, such as cellulose fibers, for example cotton and filament viscose, and wool and also synthetic polyamide fibers.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: May 8, 2001
    Assignee: Dystar Textilfarben GmbH & Co. Deutschland KG
    Inventors: Bengt-Thomas Gröbel, Christian Schumacher, Gerhard Lippert, Mieke Schaffeld, Karl Krieger, Dierk Röhrig
  • Dye mixtures of fiber-reactive azo dyes and their use
    Patent number: 6168636
    Abstract: Disclosed are dye mixtures comprising yellow dyes of the formulae indicated and defined in claim 1 which are useful for dyeing hydroxy- and/or carboxamido-containing material, especially fiber material, such as cellulose fibers, for example cotton and filament viscose, and wool and also synthetic polyamide fibers.
    Type: Grant
    Filed: November 5, 1999
    Date of Patent: January 2, 2001
    Assignee: Dystar Textilfarben GmbH & Co. Deutschland KG
    Inventors: Bengt-Thomas Gröbel, Christian Schumacher, Birgit Eden, Mieke Schaffeld, Karl Krieger, Dierk Röhrig