Granted Patent
Utility
US 4,433,242 · App. 06/294,536
ESR Hollows molten metal/slag interface detection
Inventors:
Bernard Harris, Howard J. Klein
Patented Case
View Patent ↗
Granted: Feb 21, 1984
Filed: Aug 20, 1981
Inventors
Bernard Harris
Howard J. Klein
Assignee (at issue)
Cabot 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.