Patents by Inventor Willi Hunold

Willi Hunold 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).

  • Length of material, in particular for filtering, method for its manufacture and applicability
    Patent number: 4788100
    Abstract: A filter fabric comprises a needle felt substrate comprised of a non-woven air permeable fabric having spaced surfaces. An open pour air permeable plastic foam is incorporated into the substrate and extends from one surface toward the other.
    Type: Grant
    Filed: April 21, 1987
    Date of Patent: November 29, 1988
    Assignee: Thomas Josef Heimbach GmbH & Co.
    Inventors: Eberhard Janssen, Willi Hunold