Granted Patent
Utility
US 4,370,161 · App. 06/261,397
Ore reduction using calcium oxide desulfurization
Inventor:
Ethem T. Turkdogan
Patented Case
View Patent ↗
Granted: Jan 25, 1983
Filed: May 7, 1981
Inventor
Ethem T. Turkdogan
Assignee (at issue)
United States Steel 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.