Granted Patent
Utility
US 4,689,200 · App. 06/838,890
Systems inhibited against corrosion and/or scale deposition
Inventors:
Barry Cook, Norman Richardson, Joseph Tames
Patented Case
View Patent ↗
Granted: Aug 25, 1987
Filed: Mar 11, 1986
Inventors
Barry Cook
Norman Richardson
Joseph Tames
Assignee (at issue)
Ciba-Geigy
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.