Patents by Inventor Hans-Werner Zillger

Hans-Werner Zillger 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).

  • Preparation of stable anionic dyestuff solutions: pressure permeation of crude dye in solution of lithium or ammonium salt
    Patent number: 5096458
    Abstract: Stable aqueous solutions of anionic dyestuffs, preferably reactive dyestuffs, are obtained at very low costs by pressure permeation, if the feed solution for the pressure permeation is prepared by stirring the optionally dried presscake or the suspension of the crude dyestuff in an electrolyte solution.
    Type: Grant
    Filed: December 13, 1990
    Date of Patent: March 17, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Martin Michna, Hans-Werner Zillger, Dietrich Tegtmeyer