Granted Patent
Utility
US 6,676,909 · App. 09/915,105
Method for recovery of metals from metal-containing materials using medium temperature pressure leaching
Inventors:
John O. Marsden, Robert E. Brewer, Joanna M. Robertson, Wayne W. Hazen, Philip Thompson, David R. Baughman, Roland Schmidt
Patented Case
View Patent ↗
Granted: Jan 13, 2004
Filed: Jul 25, 2001
Inventors
John O. Marsden
Robert E. Brewer
Joanna M. Robertson
Wayne W. Hazen
Philip Thompson
David R. Baughman
Roland Schmidt
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.