Granted Patent
Utility
US 4,324,943 · App. 06/162,392
DC Arc furnace hearth construction
Inventors:
Sven-Einar Stenkvist, Bo Rappinger
Patented Case
View Patent ↗
Granted: Apr 13, 1982
Filed: Jun 23, 1980
Inventors
Sven-Einar Stenkvist
Bo Rappinger
Assignee (at issue)
Asea Aktiebolag
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.