Granted Patent
Utility
US 4,589,478 · App. 06/766,512
Pressure protected tubular heat exchanger
Inventor:
John E. Wunder
Patented Case
View Patent ↗
Granted: May 20, 1986
Filed: Aug 19, 1985
Inventor
John E. Wunder
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.