Granted Patent
Utility
US 4,658,404 · App. 06/897,320
Induction furnace with a furnace bottom and a lid
Inventors:
Georg Sick, Otto W. Stenzel, Heinz Kohnert, Hans-Johann Kemmer
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Aug 18, 1986
Inventors
Georg Sick
Otto W. Stenzel
Heinz Kohnert
Hans-Johann Kemmer
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.