Granted Patent
Utility
US 5,163,949 · App. 07/731,534
Fluid operated retractors
Inventor:
Peter M. Bonutti
Patented Case
View Patent ↗
Granted: Nov 17, 1992
Filed: Jul 17, 1991
Inventor
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.