Granted Patent
Utility
US 4,683,937 · App. 06/298,867
Ingot mold and method of producing same
Inventors:
Paul E. Hamill, Jr., Macy W. Vance
Patented Case
View Patent ↗
Granted: Aug 4, 1987
Filed: Sep 3, 1981
Inventors
Paul E. Hamill, Jr.
Macy W. Vance
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.