Granted Patent
Utility
US 4,739,054 · App. 07/028,747
Triazolopyrimidine extractants
Inventors:
Peter M. Ouan, Anthony J. Nelson
Patented Case
View Patent ↗
Granted: Apr 19, 1988
Filed: Mar 23, 1987
Inventors
Peter M. Ouan
Anthony J. Nelson
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.