Granted Patent
Utility
US 5,352,240 · App. 07/359,478
Human heart valve replacement with porcine pulmonary valve
Inventor:
Donald N. Ross
Patented Case
View Patent ↗
Granted: Oct 4, 1994
Filed: May 31, 1989
Inventor
Donald N. Ross
Assignee (at issue)
Promedica International, Inc.
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.