Granted Patent
Utility
US 4,385,918 · App. 06/342,853
Method and apparatus for feeding raw material to an arc furnace
Inventors:
Charles S. Dunn, Stephen Seng
Patented Case
View Patent ↗
Granted: May 31, 1983
Filed: Jan 26, 1982
Inventors
Charles S. Dunn
Stephen Seng
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.