Granted Patent
Utility
US 6,663,689 · App. 10/238,399
Process for direct electrowinning of copper
Inventors:
John O. Marsden, Robert E. Brewer, Joanna M. Robertson, David R. Baughman, Philip Thompson, Wayne W. Hazen, Christel M. A. Bemelmans
Patented Case
View Patent ↗
Granted: Dec 16, 2003
Filed: Sep 9, 2002
Inventors
John O. Marsden
Robert E. Brewer
Joanna M. Robertson
David R. Baughman
Philip Thompson
Wayne W. Hazen
Christel M. A. Bemelmans
Assignee (at issue)
Phelps Dodge 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.