Patents by Inventor Helmut Stoelcker

Helmut Stoelcker 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).

  • Process for waterproofing leather at low pH-values and leathers manufactured thereby
    Patent number: 5980578
    Abstract: The present invention relates to a process for waterproofing leathers, furs and other fibrous materials wherein waterproofing is carried out with conventional water repellents in the presence of dispersing or stabilizing auxiliary agents at pH-values of 3.5 to 5. Alkoxy-groups-containing copolymers, synthetic or natural fatliquors and/or synthetic retanning agents (syntans) are preferably used as dispersing or stabilizing auxiliary agents.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: November 9, 1999
    Assignee: Stockhausen GmbH & Co. KG
    Inventors: Manfred Kaussen, Helmut Stoelcker