Patents by Inventor Erhard Westerhoff

Erhard Westerhoff 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).

  • Intracorporal drive to produce a continuous traction or pressure and method of operating the same
    Patent number: 4157715
    Abstract: An intracorporal drive, and method of operating the same, especially for an extension unit for extension osteotomy and for a compression unit for pressure osteosynthesis, wherein the driving power is generated by the osmotic pressure between two differently concentrated solutions separated from each other by a semipermeable diaphragm or membrane. The solution of low concentration also can be substituted by pure solvent.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: June 12, 1979
    Inventor: Erhard Westerhoff