Granted Patent
Utility
US 4,423,007 · App. 06/283,318
Removal of radium from aqueous sulphate solutions
Inventors:
Donald R. Weir, Ian M. Masters, Manfred G. Neven
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Jul 13, 1981
Inventors
Donald R. Weir
Ian M. Masters
Manfred G. Neven
Assignee (at issue)
Sherritt Gordon Mines 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.