Granted Patent
Utility
US 4,311,681 · App. 06/150,866
Method of regenerating phosphoric acid extraction solvent
Inventors:
John S. C. Chiang, William S. Moore
Patented Case
View Patent ↗
Granted: Jan 19, 1982
Filed: May 19, 1980
Inventors
John S. C. Chiang
William S. Moore
Assignee (at issue)
FMC CORPORATION
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.