Granted Patent
Utility
US 5,271,242 · App. 08/006,969
Heat pump with heat exchanger air inlet/exhaust duct
Inventor:
Robert R. Addington
Patented Case
View Patent ↗
Granted: Dec 21, 1993
Filed: Jan 21, 1993
Inventor
Robert R. Addington
Assignee (at issue)
Consolidated Technology Corp.
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.