Granted Patent
Utility
US 5,152,964 · App. 07/657,338
Membrane blood oxygenator
Inventor:
Ronald J. Leonard
Patented Case
View Patent ↗
Granted: Oct 6, 1992
Filed: Feb 15, 1991
Inventor
Ronald J. Leonard
Assignee (at issue)
Minnesota Mining and Manufacturing Company
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.