Granted Patent
Utility
US 4,306,919 · App. 06/184,065
Process for carburizing steel
Inventors:
Raymond P. Roberge, Jack Solomon
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Sep 4, 1980
Inventors
Raymond P. Roberge
Jack Solomon
Assignee (at issue)
Union Carbide Corporation
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.