Patents by Inventor Roland Willi

Roland Willi 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).

  • Acetabular cup prosthesis
    Patent number: 4936861
    Abstract: The plastic cup-comprising member and the hemispherical shell of the two-part acetabular cup prosthesis are secured relative to one another in snap-fitted manner. The plastic member is centered and guided during pressing-in via a centering pin and concentric annular web on the plastic member. The annular web is also locally deformable so as to deform against a screw head during pressing-in without the annular web losing its centering guiding action.
    Type: Grant
    Filed: October 7, 1988
    Date of Patent: June 26, 1990
    Assignees: Sulzer Brothers Limited, Protek AG
    Inventors: Maurice E. Muller, Otto Frey, Roland Willi