Granted Patent
Utility
US 6,113,804 · App. 08/145,239
Composition and use of the composition for the extraction of metals from aqueous solution
Inventors:
Raymond F. Dalton, John Lindley Leng
Patented Case
View Patent ↗
Granted: Sep 5, 2000
Filed: Nov 3, 1993
Inventors
Raymond F. Dalton
John Lindley Leng
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.