Granted Patent
Utility
US 4,765,909 · App. 07/042,150
Ion exchange method for separation of scandium and thorium
Inventors:
William J. Rourke, Wen-Chao Lai, Samuel Natansohn
Patented Case
View Patent ↗
Granted: Aug 23, 1988
Filed: Apr 23, 1987
Inventors
William J. Rourke
Wen-Chao Lai
Samuel Natansohn
Assignee (at issue)
GTE Laboratories Incorporated
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.