Granted Patent
Utility
US 4,436,289 · App. 06/303,289
Method and apparatus for controlling the atmosphere in a carburizing furnace utilizing a cascaded valving system
Inventors:
John J. Connelly, Raymond A. Cellitti
Patented Case
View Patent ↗
Granted: Mar 13, 1984
Filed: Sep 17, 1981
Inventors
John J. Connelly
Raymond A. Cellitti
Assignee (at issue)
International Harvester Company
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.