Patents by Inventor Hanns P. Liebig

Hanns P. Liebig 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).

  • Method and apparatus for joining superposes metal sheets
    Patent number: 5517743
    Abstract: A method and a tool set for joining superposed metal sheets are disclosed. In a first step, a preferably ring-shaped free space is provided by dislocating material of at least one sheet. Thereafter, material of all sheets is squeezed within the confines of the free space whereby material flows laterally into the free space producing an interengaging form lock.
    Type: Grant
    Filed: September 15, 1994
    Date of Patent: May 21, 1996
    Assignee: Eckold GmbH & Co. KG
    Inventors: Hanns P. Liebig, Peter Sack