Granted Patent
Utility
US 6,814,715 · App. 09/992,211
Expandable cannula
Inventors:
Peter M. Bonutti, James S. Hawkins
Patented Case
View Patent ↗
Granted: Nov 9, 2004
Filed: Nov 16, 2001
Inventors
Peter M. Bonutti
James S. Hawkins
Assignee (at issue)
Bonutti 2003 Trust A
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.