Granted Patent
Utility
US 5,294,265 · App. 08/031,508
Non-chrome passivation for metal substrates
Inventors:
Ralph C. Gray, Michael J. Pawlik, Paul J. Prucnal, Christopher J. Baldy
Patented Case
View Patent ↗
Granted: Mar 15, 1994
Filed: Mar 15, 1993
Inventors
Ralph C. Gray
Michael J. Pawlik
Paul J. Prucnal
Christopher J. Baldy
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.