Granted Patent
Utility
US 4,525,330 · App. 06/418,833
Process for the extraction of metal values and novel metal extractants
Inventors:
Raymond F. Dalton, Raymond R. Price, Peter M. Quan, David Stewart
Patented Case
View Patent ↗
Granted: Jun 25, 1985
Filed: Sep 16, 1982
Inventors
Raymond F. Dalton
Raymond R. Price
Peter M. Quan
David Stewart
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.