Granted Patent
Utility
US 4,464,347 · App. 06/453,353
Recovery of aluminum from spent liquor
Inventor:
J. Finley Bush
Patented Case
View Patent ↗
Granted: Aug 7, 1984
Filed: Dec 27, 1982
Inventor
J. Finley Bush
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.