Granted Patent
Utility
US 5,158,447 · App. 07/470,064
Primary gas furnace control
Inventor:
Frederick J. Geary
Patented Case
View Patent ↗
Granted: Oct 27, 1992
Filed: Jan 25, 1990
Inventor
Frederick J. Geary
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.