Granted Patent
Utility
US 4,199,952 · App. 05/950,035
Modular solar powered heat pump
Inventor:
Charles A. Berg
Patented Case
View Patent ↗
Granted: Apr 29, 1980
Filed: Oct 10, 1978
Inventor
Charles A. Berg
Assignee (at issue)
Owens-Illinois 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.