Granted Patent
Utility
US 4,285,334 · App. 06/105,585
Solar heating system
Inventor:
Denver G. Collins
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Dec 20, 1979
Inventor
Denver G. Collins
Assignee (at issue)
State Industries, 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.