Granted Patent
Utility
US 4,976,605 · App. 07/356,871
Hot surface ignition system for a gas furnace, control device therefor and methods of making the same
Inventor:
Frederick J. Geary
Patented Case
View Patent ↗
Granted: Dec 11, 1990
Filed: May 24, 1989
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.