Patents by Inventor Karl Strack

Karl Strack 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).

  • Making contoured hollows
    Patent number: 4317348
    Abstract: A hollow blank, such as a tube, is inserted in between two dies and is also received by two retractable die members. The interior of the blank is closed off, but working fluid is admitted to widen the blank. Widening is at first restricted to a central portion established by conical front faces of the die members. These members are retracted while continued application of fluid pressure progressively widens the blank, urging blank material into continued abutment with the front faces of the receding die members.
    Type: Grant
    Filed: September 3, 1980
    Date of Patent: March 2, 1982
    Assignee: Mannesmann Aktiengesellschaft
    Inventors: Clemens Halene, Josef Schlichting, Karl Strack