Granted Patent
Utility
US 6,432,167 · App. 09/758,686
Processes for the recovery of copper from aqueous solutions containing nitrate ions
Inventors:
Michael J. Virnig, Phillip L. Mattison, Hans C. Hein
Patented Case
View Patent ↗
Granted: Aug 13, 2002
Filed: Jan 11, 2001
Inventors
Michael J. Virnig
Phillip L. Mattison
Hans C. Hein
Assignee (at issue)
Cognis 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.