Granted Patent
Utility
US 4,358,314 · App. 06/293,508
Metal refining process
Inventor:
Adrain S. Normanton
Patented Case
View Patent ↗
Granted: Nov 9, 1982
Filed: Aug 17, 1981
Inventor
Adrain S. Normanton
Assignee (at issue)
British Steel Corporation
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.