Granted Patent
Utility
US 6,626,979 · App. 10/238,088
Method for improving metals recovery using high temperature pressure leaching
Inventors:
John O. Marsden, Robert E. Brewer, Joanna M. Robertson, David R. Baughman, Philip Thompson, Wayne W. Hazen, Roland Schmidt
Patented Case
View Patent ↗
Granted: Sep 30, 2003
Filed: Sep 9, 2002
Inventors
John O. Marsden
Robert E. Brewer
Joanna M. Robertson
David R. Baughman
Philip Thompson
Wayne W. Hazen
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.