Granted Patent
Utility
US 5,221,487 · App. 07/782,843
Inhibition of scale formation and corrosion by sulfonated organophosphonates
Inventor:
Charles G. Carter
Patented Case
View Patent ↗
Granted: Jun 22, 1993
Filed: Oct 24, 1991
Inventor
Charles G. Carter
Assignee (at issue)
W.R. Grace & Co. Conn.
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.