Granted Patent
Utility
US 4,606,890 · App. 06/584,055
Process for conditioning metal surfaces
Inventor:
Peter R. Fisk
Patented Case
View Patent ↗
Granted: Aug 19, 1986
Filed: Feb 27, 1984
Inventor
Peter R. Fisk
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.