Granted Patent
Utility
US 4,759,401 · App. 06/870,434
Three fluid heat exchanger for cooling oil and air with fuel
Inventors:
Robert R. Pfouts, John E. Wunder, William Nostadt, Jr.
Patented Case
View Patent ↗
Granted: Jul 26, 1988
Filed: Jun 4, 1986
Inventors
Robert R. Pfouts
John E. Wunder
William Nostadt, Jr.
Assignee (at issue)
Parker-Hannifin Corporation
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.