Granted Patent
Utility
US 4,607,684 · App. 06/692,762
Leak protected heat exchanger
Inventors:
Maxwell R. Wiard, Kenneth L. Michael
Patented Case
View Patent ↗
Granted: Aug 26, 1986
Filed: Jan 18, 1985
Inventors
Maxwell R. Wiard
Kenneth L. Michael
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.