Patents by Inventor Eberhard Stier

Eberhard Stier 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).

  • Fast, brown sulfur dyestuffs and process for the preparation thereof
    Patent number: 3956332
    Abstract: Dyestuffs obtained by sulfurization of at least one compound of the formula ##SPC1##
    Type: Grant
    Filed: June 26, 1974
    Date of Patent: May 11, 1976
    Assignee: Cassella Farbwerke Mainkur Aktiengesellschaft
    Inventors: Erwin Krusche, Joachim Ribka, Eberhard Stier