Granted Patent
Utility
US 5,961,499 · App. 08/467,698
Expandable cannula
Inventors:
Peter M. Bonutti, James S. Hawkins
Patented Case
View Patent ↗
Granted: Oct 5, 1999
Filed: Jun 6, 1995
Inventors
Peter M. Bonutti
James S. Hawkins
Assignee (at issue)
Peter M. Bonutti
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.