Patents by Inventor David Roy Campbell

David Roy Campbell 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).

  • Hybrid ceramic composite implants
    Publication number: 20040220679
    Abstract: A prosthesis for total or partial replacement of an articulating skeletal joint has two opposed bearing surfaces. The opposed bearing surfaces are made of a ceramic and a metal, respectively. The ceramic material is a silicon nitride or silicon carbide and the metal is preferably a nitrogen alloyed chromium stainless steel, know as Cronidur 30.
    Type: Application
    Filed: May 1, 2003
    Publication date: November 4, 2004
    Inventors: Robert L. Diaz, Drew D. Ehlert, David Roy Campbell