Granted Patent
Utility
US 4,311,190 · App. 06/036,774
Self contained heating and cooling system with emergency heating
Inventor:
Don C. Walley
Patented Case
View Patent ↗
Granted: Jan 19, 1982
Filed: May 7, 1979
Inventor
Don C. Walley
Assignee (at issue)
RANCO CO., Ltd.
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.