Granted Patent
Utility
US 3,980,271 · App. 05/539,665
Pouring of molten metals
Inventors:
Robert D. Hind, Jeffrey Hill
Patented Case
View Patent ↗
Granted: Sep 14, 1976
Filed: Jan 9, 1975
Inventors
Robert D. Hind
Jeffrey Hill
Assignee (at issue)
United States 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.