Granted Patent
Utility
US 5,453,416 · App. 08/301,161
Composition and method for controlling phosphonates tending to precipitate metal ions in water
Inventor:
Peter K. L. G. Thevissen
Patented Case
View Patent ↗
Granted: Sep 26, 1995
Filed: Sep 6, 1994
Inventor
Peter K. L. G. Thevissen
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.