Granted Patent
Utility
US 5,727,770 · App. 08/796,193
Double valve cannula seal
Inventor:
William G. Dennis
Patented Case
View Patent ↗
Granted: Mar 17, 1998
Filed: Feb 7, 1997
Inventor
William G. Dennis
Assignee (at issue)
Core Dynamics Limited
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.