Granted Patent
Utility
US 5,011,077 · App. 07/409,568
Railways
Inventors:
William H. Hodgson, Colin G. Stanworth, David John Thompson
Patented Case
View Patent ↗
Granted: Apr 30, 1991
Filed: Sep 18, 1989
Inventors
William H. Hodgson
Colin G. Stanworth
David John Thompson
Assignees (at issue)
British Steel plc.
British Railways Board
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.