Granted Patent
Utility
US 6,497,745 · App. 09/912,945
Method for processing elemental sulfur-bearing materials using high temperature pressure leaching
Inventors:
John O. Marsden, Robert E. Brewer, Joanna M. Robertson, Wayne W. Hazen, Philip Thompson, David R. Baughman
Patented Case
View Patent ↗
Granted: Dec 24, 2002
Filed: Jul 25, 2001
Inventors
John O. Marsden
Robert E. Brewer
Joanna M. Robertson
Wayne W. Hazen
Philip Thompson
David R. Baughman
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.