Patents by Inventor Franciscus A. M. Ypma

Franciscus A. M. Ypma 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).

  • Endo-prosthesis, a femoral head prosthesis and an acetabulum prosthesis
    Patent number: 5314494
    Abstract: A prosthesis for insertion into a long bone includes a stem which has been shaped so as to evenly distribute low stress to the bone. A synthetic resinous sheath surrounds the stem which effects a contact surface between the stem and the bone. The prosthesis includes an extension which extends outwardly of the bone and has a ball and socket thereon.
    Type: Grant
    Filed: March 31, 1993
    Date of Patent: May 24, 1994
    Assignee: Orthopaedic Technology B.V.
    Inventors: Hendrik W. J. Huiskes, Franciscus A. M. Ypma, Pierre J. T. M. Jaspers