Granted Patent
Utility
US 4,243,832 · App. 06/018,799
Electric arc furnaces
Inventors:
Charles H. Parsons, Badenhorst H. Casper
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Mar 8, 1979
Inventors
Charles H. Parsons
Badenhorst H. Casper
Assignee (at issue)
Infurnco (Proprietary) Limited
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.