Granted Patent
Utility
US 4,435,813 · App. 06/380,442
DC Arc furnace component
Inventor:
Sven-Einar Stenkvist
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: May 20, 1982
Inventor
Sven-Einar Stenkvist
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.