Patents by Inventor Stefan Perren

Stefan Perren 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).

  • Osteosynthetic pressure plate construction
    Patent number: RE28841
    Abstract: An osteosynthetic pressure plate includes a slot formation for receiving a bone-fixing screw which is adapted to be secured to a bone part which is to be mended. The slot is formed with an edge which includes an oblique portion or ramp having an inclination such that when it is engaged by the underside of a head portion of a bone-fixing screw there will be a displacement of the pressure plate in a direction to move the ramp portion away from the fixing screw and to cause the plate to apply a pressure to hold the bone parts in tight engagement. The plate is advantageously useable with screws having heads of spherical form or conical form, for example.
    Type: Grant
    Filed: August 3, 1972
    Date of Patent: June 8, 1976
    Assignee: Synthes A.G.
    Inventors: Martin Allgower, Stefan Perren, Max E. Russenberger
  • Osteosynthetic pressure plate construction
    Patent number: RE31628
    Abstract: An osteosynthetic pressure plate includes a slot formation for receiving a bone-fixing screw which is adapted to be secured to a bone part which is to be mended. The slot is formed with an edge which includes an oblique portion or ramp having an inclination such that when it is engaged by the underside of a head portion of a bone-fixing screw there will be a displacement of the pressure plate in a direction to move the ramp portion away from the fixing screw and to cause the plate to apply a pressure to hold the bone parts in tight engagement. The plate is advantageously useable with screws having heads of spherical form or conical form, for example.
    Type: Grant
    Filed: April 6, 1979
    Date of Patent: July 10, 1984
    Assignee: Synthes AG
    Inventors: Martin Allgower, Stefan Perren, Max E. Russenberger