Granted Patent
Utility
US 4,457,777 · App. 06/413,872
Steelmaking
Inventors:
Ian MacGregor, Robert Scholey, Gene D. Spenceley
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Sep 1, 1982
Inventors
Ian MacGregor
Robert Scholey
Gene D. Spenceley
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.