Granted Patent
Utility
US 4,357,210 · App. 06/227,052
Electric furnace for the calcination of carbonaceous materials
Inventors:
Michel Aubry, Jean-Claude Bernard, Paul Philipon
Patented Case
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Granted: Nov 2, 1982
Filed: Feb 8, 1981
Inventors
Michel Aubry
Jean-Claude Bernard
Paul Philipon
Assignee (at issue)
Societe des Electrodes & Refractaires Savoie
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.