Granted Patent
Utility
US 4,435,818 · App. 06/381,983
Method and apparatus for monitoring the melting process in vacuum arc furnaces
Inventors:
Otto W. Stenzel, Pierre Flecker
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: May 25, 1982
Inventors
Otto W. Stenzel
Pierre Flecker
Assignee (at issue)
Leybold-Heraeus GmbH
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.