Granted Patent
Utility
US 4,457,459 · App. 06/370,716
Valve suitable for controlling teeming from furnace tapholes
Inventors:
Kenneth W. Bates, William A. Griffiths, Norman H. Watts
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Apr 22, 1982
Inventors
Kenneth W. Bates
William A. Griffiths
Norman H. Watts
Assignee (at issue)
USS Engineers and Consultants, Inc.
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.