Granted Patent
Utility
US 4,711,628 · App. 06/887,860
Hot surface ignition system for a gas furnace and method of making the same
Inventor:
Frederick J. Geary
Patented Case
View Patent ↗
Granted: Dec 8, 1987
Filed: Jul 18, 1986
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.