Patents by Inventor Johann U. Steiger

Johann U. Steiger 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).

  • Artificial acetabulum
    Patent number: 5108447
    Abstract: An artificial acetabulum has a thin metallic outer shell and a relatively thick metallic inner shell which is secured to the outer shell via a damping ring located at the peripheral edges of the shells. The outer shell has a thickness of less than one-fifth of the thickness of the inner shell to compensate for stresses in the direction of the osseous tissue during the transfer of force peaks. A centering pin is provided on the inner shell and an annular shoulder is provided on the outer shell about the centering pin to provide further elastic damping of forces transmitted between the shells.
    Type: Grant
    Filed: February 28, 1991
    Date of Patent: April 28, 1992
    Assignee: Sulzer Brothers Limited
    Inventors: Gunther Zeiler, Johann U. Steiger, Rudolf Koch, Jurg Oehy