Granted Patent
Utility
US 5,898,002 · App. 08/916,198
Method for removing ferric-ferrous oxides from a liquid
Inventor:
Terence P. Small
Patented Case
View Patent ↗
Granted: Apr 27, 1999
Filed: Aug 22, 1997
Inventor
Terence P. Small
Assignee (at issue)
Betzdearborn, Inc.
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.