Granted Patent
Utility
US 4,865,701 · App. 07/238,472
Electrolytic reduction of alumina
Inventors:
Theodore R. Beck, Richard J. Brooks
Patented Case
View Patent ↗
Granted: Sep 12, 1989
Filed: Aug 31, 1988
Inventors
Theodore R. Beck
Richard J. Brooks
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.