Granted Patent
Utility
US 6,217,739 · App. 09/431,756
Electrolytic production of high purity aluminum using inert anodes
Inventors:
Siba P. Ray, Xinghua Liu, Douglas A. Weirauch, Jr.
Patented Case
View Patent ↗
Granted: Apr 17, 2001
Filed: Nov 1, 1999
Inventors
Siba P. Ray
Xinghua Liu
Douglas A. Weirauch, Jr.
Assignee (at issue)
ALCOA INC.
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.