Granted Patent
Utility
US 4,391,104 · App. 06/339,540
Cascade heat pump for heating water and for cooling or heating a comfort zone
Inventor:
James C. Wendschlag
Patented Case
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Granted: Jul 5, 1983
Filed: Jan 15, 1982
Inventor
James C. Wendschlag
Assignee (at issue)
The Trane Company
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.