Granted Patent
Utility
US 5,209,788 · App. 07/616,523
Non-chrome final rinse for phosphated metal
Inventors:
Mark W. McMillen, F. Leon Bergeron
Patented Case
View Patent ↗
Granted: May 11, 1993
Filed: Nov 21, 1990
Inventors
Mark W. McMillen
F. Leon Bergeron
Assignee (at issue)
PPG 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.