Granted Patent
Utility
US 4,337,085 · App. 06/192,285
Recovery of precious metals from spent alumina-containing catalysts
Inventor:
Paul Cichy
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: Sep 30, 1980
Inventor
Paul Cichy
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.