Granted Patent
Utility
US 4,284,515 · App. 06/102,167
Process for decreasing elemental phosphorus levels in an aqueous medium
Inventor:
Chong Liu
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Dec 10, 1979
Inventor
Chong Liu
Assignee (at issue)
Stauffer Chemical Company
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.