Granted Patent
Utility
US 4,288,062 · App. 06/065,308
Apparatus for control and monitoring of the carbon potential of an atmosphere in a heat-processing furnace
Inventors:
Bhupendra K. Gupta, Paul K. Shefsiek, Freeman W. Fraim
Patented Case
View Patent ↗
Granted: Sep 8, 1981
Filed: Aug 9, 1979
Inventors
Bhupendra K. Gupta
Paul K. Shefsiek
Freeman W. Fraim
Assignee (at issue)
Holcroft 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.