Granted Patent
Utility
US 4,775,981 · App. 07/116,000
Melting furnace with weight-related control of the consumable electrode
Inventors:
Heinz Kohnert, Rudolf Randa, Otto W. Stenzel
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Nov 2, 1987
Inventors
Heinz Kohnert
Rudolf Randa
Otto W. Stenzel
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.