Granted Patent
Utility
US 4,778,445 · App. 06/936,975
Centrifugal blood pump with backflow detection
Inventors:
Lloyd C. Hubbard, Earl W. Clausen
Patented Case
View Patent ↗
Granted: Oct 18, 1988
Filed: Nov 28, 1986
Inventors
Lloyd C. Hubbard
Earl W. Clausen
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.