Granted Patent
Utility
US 4,976,459 · App. 07/478,206
Warmup method for a two stage furnace
Inventor:
Gregory A. Lynch
Patented Case
View Patent ↗
Granted: Dec 11, 1990
Filed: Feb 9, 1990
Inventor
Gregory A. Lynch
Assignee (at issue)
Inter-City Products Corporation (USA)
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.