Granted Patent
Utility
US 5,019,362 · App. 07/423,312
Ion exchange method for the purification of scandium
Inventors:
William J. Rourke, Samuel Natansohn
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: Oct 18, 1989
Inventors
William J. Rourke
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.