Granted Patent
Utility
US 4,142,952 · App. 05/756,067
Copper extraction with salicylaldoxime-P-nonylphenol mixtures
Inventor:
Raymond F. Dalton
Patented Case
View Patent ↗
Granted: Mar 6, 1979
Filed: Jan 3, 1977
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.