Granted Patent
Utility
US 5,458,678 · App. 08/222,766
Alkaline earth metal salts, transition metal salts and transition metal complexes of ketocarboxylic acids as corrosion inhibitors
Inventors:
William Armstrong, Adalbert Braig, Markus Frey, Andreas Kramer
Patented Case
View Patent ↗
Granted: Oct 17, 1995
Filed: Apr 4, 1994
Inventors
William Armstrong
Adalbert Braig
Markus Frey
Andreas Kramer
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.