Granted Patent
Utility
US 4,990,179 · App. 07/513,121
Process for increasing the life of carbon crucibles in plasma furnaces
Inventors:
Theodore F. Munday, Richard A. Mohr
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Apr 23, 1990
Inventors
Theodore F. Munday
Richard A. Mohr
Assignee (at issue)
FMC 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.