Granted Patent
Utility
US 5,573,517 · App. 08/254,368
Expandable cannulas
Inventors:
Peter M. Bonutti, James S. Hawkins
Patented Case
View Patent ↗
Granted: Nov 12, 1996
Filed: Jun 6, 1994
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.