Granted Patent
Utility
US 4,599,107 · App. 06/735,741
Method for controlling secondary top-blown oxygen in subsurface pneumatic steel refining
Inventor:
Ian F. Masterson
Patented Case
View Patent ↗
Granted: Jul 8, 1986
Filed: May 20, 1985
Inventor
Ian F. Masterson
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.