Granted Patent
Utility
US 5,250,325 · App. 08/006,443
Corrosion inhibitors
Inventors:
Emyr Phillips, William Armstrong
Patented Case
View Patent ↗
Granted: Oct 5, 1993
Filed: Jan 21, 1993
Inventors
Emyr Phillips
William Armstrong
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.