Granted Patent
Utility
US 4,589,992 · App. 06/661,624
New salts useful as corrosion inhibitors
Inventors:
Emyr Phillips, David A. Wilson
Patented Case
View Patent ↗
Granted: May 20, 1986
Filed: Oct 17, 1984
Inventors
Emyr Phillips
David A. Wilson
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.