Granted Patent
Utility
US 4,265,769 · App. 06/087,133
Method of treating aqueous systems with phosphonoadipic acids
Inventors:
John G. Dingwall, Barry Cook, Alan Marshall
Patented Case
View Patent ↗
Granted: May 5, 1981
Filed: Oct 22, 1979
Inventors
John G. Dingwall
Barry Cook
Alan Marshall
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.