Granted Patent
Utility
US 4,114,597 · App. 05/645,648
Unitary solar collector
Inventor:
Robert A. Erb
Patented Case
View Patent ↗
Granted: Sep 19, 1978
Filed: Dec 31, 1975
Inventor
Robert A. Erb
Assignee (at issue)
The Franklin Institute
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.