Granted Patent
Utility
US 4,681,671 · App. 06/829,435
Low temperature alumina electrolysis
Inventor:
Jean-Jacques Duruz
Patented Case
View Patent ↗
Granted: Jul 21, 1987
Filed: Feb 13, 1986
Inventor
Jean-Jacques Duruz
Assignee (at issue)
Eltech Systems 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.