Granted Patent
Utility
US 4,883,455 · App. 07/243,896
Cardioplegia administration set
Inventor:
Ronald J. Leonard
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Sep 13, 1988
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.