Patents by Inventor Horst Thonnes

Horst Thonnes 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).

  • Piercing a solid billet
    Patent number: 4129022
    Abstract: An initial well is formed into the rear end of a cylindrical billet thereby providing a centering collar. The billet is additionally centered at the receiver bottom and pierced by a frustoconical mandrel under retention of the well.
    Type: Grant
    Filed: July 27, 1977
    Date of Patent: December 12, 1978
    Assignee: Mannesmann Aktiengesellschaft
    Inventors: Horst Thonnes, Joachim Wunsche