Granted Patent
Utility
US 4,496,404 · App. 06/611,663
Composition and process for treatment of ferrous substrates
Inventor:
Peter F. King
Patented Case
View Patent ↗
Granted: Jan 29, 1985
Filed: May 18, 1984
Inventor
Peter F. King
Assignee (at issue)
Parker Chemical Company
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.