Granted Patent
Utility
US 4,408,596 · App. 06/190,665
Heat exchange system
Inventor:
Douglas L. Worf
Patented Case
View Patent ↗
Granted: Oct 11, 1983
Filed: Sep 25, 1980
Inventor
Douglas L. Worf
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.