Granted Patent
Utility
US 4,428,773 · App. 06/454,803
Process for treating spent fluids to recover copper and copper oxide
Inventor:
Kenneth J. Krotz
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Dec 30, 1982
Inventor
Kenneth J. Krotz
Assignee (at issue)
Western Electric Company, Inc.
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.