Patents by Inventor Helmut Croon

Helmut Croon 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).

  • Tanning agent and a process for its preparation
    Patent number: 4828570
    Abstract: Hides, skins and pelts are tanned by use of a tanning agent which comprises the reaction product of acetaldehyde, formaldehyde and a formylamino compound.
    Type: Grant
    Filed: October 9, 1986
    Date of Patent: May 9, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Ulrich Riegel, Fritz Engelhardt, Kuno Reh, Helmut Croon, Hermann Becker, Werner Lotz