Patents by Inventor Frank-Michael Stuohr

Frank-Michael Stuohr 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).

  • Azo dyestuffs and intermediate products for their preparation
    Patent number: 5278293
    Abstract: Azo dyestuffs of the formula ##STR1## having the substituent meanings given in the description, are outstandingly suitable for dyeing and printing materials containing hydroxyl groups and amide groups.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: January 11, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl-Josef Herd, Manfred Hoppe, Hermann Henk, Klaus Kunde, Frank-Michael Stuohr