Granted Patent
Utility
US 5,173,920 · App. 07/774,381
Direct-current electric-arc furnace
Inventors:
Walter Bochsler, Ante Eterovic, Sven-Einar Stenkvist
Patented Case
View Patent ↗
Granted: Dec 22, 1992
Filed: Oct 10, 1991
Inventors
Walter Bochsler
Ante Eterovic
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.