Granted Patent
Utility
US 4,853,941 · App. 07/168,899
D.C. arc furnace having electrically conductive hearth and method for making same
Inventors:
Bo Rappinger, Sven-Einar Stenkvist
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: Mar 16, 1988
Inventors
Bo Rappinger
Sven-Einar Stenkvist
Assignee (at issue)
Asea Brown Boveri, S.A.
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.