Patents by Inventor Gunther Held

Gunther Held 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).

  • Leather treatment agent and its use
    Patent number: 5103521
    Abstract: Leather treatment agent containing a mixture a) of a carboxylic acidX--COOH Iwherein X represents--[R--CO--Z--(R'--Z).sub.a ].sub.b --CO--R--COOH 1or--R"--(Z--R').sub.c --Z--CO--R--COOH 2and the symbols have the meaning described in more detail in the description, and b) of a compound containing at least one primary, secondary or tertiary amino group, with a molecular weight of 200-20,000, are used in processes for tanning, pretanning, retanning, dyeing or fat liquoring pelts or pretanned leather or fully tanned leather.
    Type: Grant
    Filed: August 11, 1989
    Date of Patent: April 14, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Harro Traubel, Manfred Dietrich, Hans-Werner Muller, Gunther Held