Granted Patent
Utility
US 4,222,779 · App. 06/045,160
Non-chromate conversion coatings
Inventors:
Ajay M. Bengali, Richard F. Zuendt, John L. H. Allan, Philip D. Readio
Patented Case
View Patent ↗
Granted: Sep 16, 1980
Filed: Jun 4, 1979
Inventors
Ajay M. Bengali
Richard F. Zuendt
John L. H. Allan
Philip D. Readio
Assignee (at issue)
Dart Industries Inc.
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.