Granted Patent
Utility
US 4,479,922 · App. 06/482,077
Solvent treatment in the separation of palladium and/or gold from other platinum group and base metals
Inventors:
Richard Haynes, Anna Jackson, Martin K. Zierold
Patented Case
View Patent ↗
Granted: Oct 30, 1984
Filed: Apr 4, 1983
Inventors
Richard Haynes
Anna Jackson
Martin K. Zierold
Assignee (at issue)
AT&T Technologies Incorporated
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.