Granted Patent
Utility
US 4,865,539 · App. 07/235,374
Fuel control unit for a gas furnace and method of making the same
Inventor:
Frederick J. Geary
Patented Case
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Granted: Sep 12, 1989
Filed: Aug 23, 1988
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.