Patents by Inventor Friedhelm Schäfer

Friedhelm Schäfer 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).

  • Winding tube and method for the production thereof
    Patent number: 7040569
    Abstract: The invention relates to a winding tube for winding up bands, films, sheets of metal or similar made of a spiral shaped wound metal strip whose adjacent strip windings overlap at least partially. The metal strip has a corrugated or ribbed profile in the cross-section thereof, whose external corrugated heads (1) are disposed on the outer wall of the winding tube after winding and are wider than the internal corrugated heads (2) disposed on the inner wall of the winding tube after winding.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: May 9, 2006
    Assignee: Alcan International Limited
    Inventors: Friedhelm Schäfer, Friedrich Werner