Granted Patent
Utility
US 4,394,161 · App. 06/393,228
Method of producing a vanadium- and nitrogen-containing material for use as an addition to steel
Inventor:
Roy R. Hannum
Patented Case
View Patent ↗
Granted: Jul 19, 1983
Filed: Jun 28, 1982
Inventor
Roy R. Hannum
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.