Patents by Inventor Erhard Doerre

Erhard Doerre 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).

  • Joint endoprosthesis
    Patent number: 4058856
    Abstract: The metal male joint part has a taper which is less than that of the cavity of the oxide ceramic female joint part. In addition, the surface of the male part has a resistance to deformation which is less than that of the core of the male part. The cone angle .beta. of the female cavity and the cone angle .alpha. of the male joint part are in the relation:tan .beta./2 - 0.001 .ltoreq. tan .alpha./2 .ltoreq. tan .beta./2 - 0.005.
    Type: Grant
    Filed: October 12, 1976
    Date of Patent: November 22, 1977
    Assignee: Sulzer Brothers Limited
    Inventors: Erhard Doerre, Manfred Semlitsch, Otto Frey