Granted Patent
Utility
US 4,984,972 · App. 07/426,102
Centrifugal blood pump
Inventors:
Earl W. Clausen, Lloyd C. Hubbard
Patented Case
View Patent ↗
Granted: Jan 15, 1991
Filed: Oct 24, 1989
Inventors
Earl W. Clausen
Lloyd C. Hubbard
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.