Granted Patent
Utility
US 4,565,561 · App. 06/678,425
Method of and apparatus for analyzing atmosphere of a furnace
Inventor:
Robert R. Gagne
Patented Case
View Patent ↗
Granted: Jan 21, 1986
Filed: Dec 5, 1984
Inventor
Robert R. Gagne
Assignee (at issue)
PPG Industries, Inc.
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.