Granted Patent
Utility
US 4,308,113 · App. 06/170,637
Process for producing aluminum using graphite electrodes having reduced wear rates
Inventor:
Subodh K. Das
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Jul 21, 1980
Inventor
Subodh K. Das
Assignee (at issue)
Aluminum Company of America
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.