Granted Patent
Utility
US 5,397,379 · App. 08/124,530
Process and additive for the ladle refining of steel
Inventors:
Bruce J. Barker, William C. Weber, William J. West
Patented Case
View Patent ↗
Granted: Mar 14, 1995
Filed: Sep 22, 1993
Inventors
Bruce J. Barker
William C. Weber
William J. West
Assignee (at issue)
Oglebay Norton 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.