Granted Patent
Utility
US 5,853,392 · App. 08/832,294
Sleeve trocar with penetration indicator
Inventor:
William G. Dennis
Patented Case
View Patent ↗
Granted: Dec 29, 1998
Filed: Apr 3, 1997
Inventor
William G. Dennis
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.