Granted Patent
Utility
US 4,308,115 · App. 06/178,546
Method of producing aluminum using graphite cathode coated with refractory hard metal
Inventors:
Perry A. Foster, Jr., Subodh K. Das, Aaron J. Becker
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Aug 15, 1980
Inventors
Perry A. Foster, Jr.
Subodh K. Das
Aaron J. Becker
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.