Granted Patent
Utility
US 4,530,955 · App. 06/594,149
Water treatment composition comprising a hydrolyzed maleic anhydride copolymer and a zinc compound
Inventors:
David A. Wilson, John A. Reverter
Patented Case
View Patent ↗
Granted: Jul 23, 1985
Filed: Mar 28, 1984
Inventors
David A. Wilson
John A. Reverter
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.