Granted Patent
Utility
US 6,451,021 · App. 09/789,935
Polyaxial pedicle screw having a rotating locking element
Inventors:
James D. Ralph, Stephen Tatar
Patented Case
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Granted: Sep 17, 2002
Filed: Feb 15, 2001
Inventors
James D. Ralph
Stephen Tatar
Assignee (at issue)
THIRD MILLENNIUM ENGINEERING
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.