Patents by Inventor Wolfgang Karnath

Wolfgang Karnath 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: 4909853
    Abstract: Pigment preparations which contain an organic pigment and/or carbon black and a surfactant from the sulphosuccinic acid ester and/or alkylbenzenesulphonate series and which have been dried, if appropriate after wet comminution, by spray- or freeze-drying from an aqueous medium, and the use of these preparations for pigmenting high molecular weight organic material, in particular thermoplastics.
    Type: Grant
    Filed: March 1, 1988
    Date of Patent: March 20, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Martin Wienkenhover, Volker Paulat, Wolfgang Karnath, Hans Schulze, Karlheinz Wolf, Karl-Heinz Wieser