Patents by Inventor Stephen M. Perren

Stephen M. Perren 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).

  • Patent number: 5019078
    Abstract: A bone screw has a smooth shaft segment, a threaded segment and a tapered transition segment between the shaft and the threaded segment.
    Type: Grant
    Filed: November 17, 1989
    Date of Patent: May 28, 1991
    Assignee: Synthes (U.S.A.)
    Inventors: Stephen M. Perren, Robert Frigg, Paul Gisin, Robert Mathys, Jr.