Granted Patent
Utility
US 5,213,777 · App. 07/845,822
Process for the recovery of metals
Inventor:
Raymond F. Dalton
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: Mar 6, 1992
Inventor
Raymond F. Dalton
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.