Patents by Inventor Gerhard Radtke

Gerhard Radtke 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).

  • Instrument for removal of a bone cement tube in an artificial femur head reimplantation
    Patent number: 4476861
    Abstract: An instrument for removal of a hollow bone cement tube from a femur reimplantation having an elongate hollow tube adapted to be inserted into the bone cement tube to be removed with a collet at the insertion end of the hollow tube being radially expanded to engage the bone cement tube on the interior thereof by rotation of a mandrel having the collet threadedly engaged on the insertion end thereof. The hollow tube engages the collet to prevent relative rotation therewith and to allow the mandrel by threaded engagement with the collet to effect radial expansion thereof.
    Type: Grant
    Filed: May 5, 1983
    Date of Patent: October 16, 1984
    Inventors: Christos Dimakos, Gerhard Radtke
  • Guiding a mandrel or punch for piercing or cold-extrusion
    Patent number: 4416139
    Abstract: A piercing mandrel or punch, particularly for backward extrusion, is guided by a member which centers the mandrel or punch in the upper die cavity and is coupled thereto until abutting a centering shoulder in the die cavity; the guiding and centering function continues as the mandrel or punch begins and progresses in the cold flow-working process.
    Type: Grant
    Filed: June 1, 1981
    Date of Patent: November 22, 1983
    Assignee: Mannesmann Aktiengesellschaft
    Inventors: Heinrich Hesse, Anton Merkler, Siegfried Gross, Gerhard Radtke