Granted Patent
Utility
US 4,336,231 · App. 06/152,828
Copper extraction with either salicylaldoximes or benzophenone oximes and alkylphenols
Inventor:
Raymond F. Dalton
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: May 23, 1980
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.