Granted Patent
Utility
US 4,811,588 · App. 07/176,770
Heat conservation of hot metal slabs
Inventor:
James Watson
Patented Case
View Patent ↗
Granted: Mar 14, 1989
Filed: Apr 1, 1988
Inventor
James Watson
Assignee (at issue)
British Steel plc.
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.