Patents by Inventor Dennis L. Armstrong

Dennis L. Armstrong 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).

  • Offset trial stem
    Patent number: 6149687
    Abstract: An offset trial stem system includes a baseplate and a trial stem. The trial stem has a main body portion and a baseplate connection portion. The baseplate connection portion is threadably attached to the baseplate, and is offset from, and connected to, the main body portion by a transition portion. A threaded member is provided for attaching the trial stem to the baseplate. The threaded member is mounted for reciprocating and rotating movement in the trial stem.
    Type: Grant
    Filed: July 10, 1998
    Date of Patent: November 21, 2000
    Assignee: Sulzer Orthopedics Inc.
    Inventors: Wayne P. Gray, Jr., Dennis L. Armstrong
  • Offset press-fit tibial stem
    Patent number: 6146424
    Abstract: An offset, press-fit tibial stem system includes a baseplate, a main body portion, a baseplate connection portion attached to the baseplate and being offset from, and connected to, the main body portion by a transition portion. The main body portion has a first centroidal axis passing therethrough and the baseplate connection portion has a second centroidal axis passing therethrough. The offset is such that the first centroidal axis and the second centroidal axis are slightly spaced apart and substantially parallel so as to each pass through the main body portion.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: November 14, 2000
    Assignee: Sulzer Orthopedics Inc.
    Inventors: Wayne P. Gray, Jr., Dennis L. Armstrong