Patents by Inventor Keith Greer

Keith Greer 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).

  • Low crystalline polymeric material for orthopaedic implants and an associated method
    Patent number: 7384430
    Abstract: A component made from a crosslinked polymeric material, wherein the crosslinked polymeric material has a reduced crystallinity is described. An associated method for fabricating such a component is also described.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: June 10, 2008
    Assignee: DePuy Products, Inc.
    Inventors: Keith Greer, Richard S. King
  • Low crystalline polymeric material for orthopaedic implants and an associated method
    Publication number: 20060004168
    Abstract: A component made from a crosslinked polymeric material, wherein the crosslinked polymeric material has a reduced crystallinity is described. An associated method for fabricating such a component is also described.
    Type: Application
    Filed: June 30, 2004
    Publication date: January 5, 2006
    Inventors: Keith Greer, Richard King
  • Low temperature pressure stabilization of implant component
    Patent number: 6184265
    Abstract: Wear resistance and oxidation resistance of polymer material or a polymer component for bioimplantation are improved by packaging a polymer object in a sealed gas impermeable package substantially free of oxygen, irradiating the package with penetrating radiation to an extent sufficient to effect a desired substantial level of cross-linking within the polymer, and warming the packaged object while maintaining an elevated hydrostatic pressure to cause gases released during irradiation to recombine, stabilizing the material against subsequent oxidative change. The pressure stabilization terminates active sites, substantially eliminating free radicals. When applied to finished parts, the process simultaneously hardens and sterilizes the parts without degrading mechanical properties or dimensions. When applied to bulk material or unfinished parts, the part may be subsequent machined or otherwise finished, and sterilized by any conventional means.
    Type: Grant
    Filed: July 29, 1999
    Date of Patent: February 6, 2001
    Assignee: Depuy Orthopaedics, Inc.
    Inventors: John V. Hamilton, Mary Beth Schmidt, Keith Greer