Granted Patent
Utility
US 5,336,166 · App. 07/991,982
Three stage implantable valve
Inventor:
Rolando Sierra
Patented Case
View Patent ↗
Granted: Aug 9, 1994
Filed: Dec 17, 1992
Inventor
Rolando Sierra
Assignee (at issue)
CORDIS CORPORATION
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.