Granted Patent
Utility
US 5,274,663 · App. 07/897,824
Direct-current arc furnace plant
Inventor:
Sven-Einar Stenkvist
Patented Case
View Patent ↗
Granted: Dec 28, 1993
Filed: Jun 12, 1992
Inventor
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.