Granted Patent
Utility
US 5,443,622 · App. 08/202,819
Hydrometallurgical processing of impurity streams generated during the pyrometallurgy of copper
Inventors:
Philip J. Gabb, Kenton E. Sutliff, Barry A. Wells, J. Philip Evans
Patented Case
View Patent ↗
Granted: Aug 22, 1995
Filed: Feb 28, 1994
Inventors
Philip J. Gabb
Kenton E. Sutliff
Barry A. Wells
J. Philip Evans
Assignee (at issue)
Kennecott Holdings Company
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.