Granted Patent
Utility
US 4,138,464 · App. 05/863,988
Blood oxygenator with integral heat exchanger
Inventor:
John E. Lewin
Patented Case
View Patent ↗
Granted: Feb 6, 1979
Filed: Dec 23, 1977
Inventor
John E. Lewin
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.