Granted Patent
Utility
US 4,380,156 · App. 06/330,005
Multiple source heat pump
Inventor:
Amir L. Ecker
Patented Case
View Patent ↗
Granted: Apr 19, 1983
Filed: Dec 11, 1981
Inventor
Amir L. Ecker
Assignee (at issue)
Atlantic Richfield 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.