Granted Patent
Utility
US 4,620,588 · App. 06/676,500
Three fluid heat exchanger with pressure responsive control
Inventors:
Robert R. Pfouts, John E. Wunder, William Nostadt, Jr.
Patented Case
View Patent ↗
Granted: Nov 4, 1986
Filed: Nov 29, 1984
Inventors
Robert R. Pfouts
John E. Wunder
William Nostadt, Jr.
Assignee (at issue)
United Aircraft Products, Inc.
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.