Granted Patent
Utility
US 4,623,019 · App. 06/781,696
Heat exchanger with heat transfer control
Inventor:
Maxwell R. Wiard
Patented Case
View Patent ↗
Granted: Nov 18, 1986
Filed: Sep 30, 1985
Inventor
Maxwell R. Wiard
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.