Patents by Inventor Hans-Jürgen Hartrumpf

Hans-Jürgen Hartrumpf 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).

  • Pigment preparations
    Patent number: 6881255
    Abstract: Pigment preparations comprising a) at least one pigment, b) at least one polyethyleneimine which is alkoxylated, especially ethoxylated and propoxylated and/or butoxylated, and c) at least one condensation product based on A) sulphonated aromatics, B) aldehydes and/or ketones and optionally C) one or more compounds selected from the group consisting of nonsulphonated aromatics, urea and urea derivatives.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: April 19, 2005
    Assignee: Bayer Chemicals AG
    Inventors: Udo Herrmann, Dirk Pfützenreuter, Josef Witt, Hans-Jürgen Hartrumpf