Granted Patent
Utility
US 4,816,233 · App. 07/095,367
Ion exchange method for the recovery of scandium
Inventors:
William J. Rourke, Wen-Chao Lai, Samuel Natansohn
Patented Case
View Patent ↗
Granted: Mar 28, 1989
Filed: Sep 11, 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.