Granted Patent
Utility
US 4,666,515 · App. 06/863,324
Method for adding bismuth to steel in a ladle
Inventors:
Howard M. Pielet, Nassos A. Lazaridis, Robert D. O'Neil
Patented Case
View Patent ↗
Granted: May 19, 1987
Filed: May 15, 1986
Inventors
Howard M. Pielet
Nassos A. Lazaridis
Robert D. O'Neil
Assignee (at issue)
Inland Steel 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.