Granted Patent
Utility
US 5,149,382 · App. 07/749,237
Method of pretreating metal by means of composition containing S-triazine compound
Inventor:
Ralph C. Gray
Patented Case
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Granted: Sep 22, 1992
Filed: Aug 23, 1991
Inventor
Ralph C. Gray
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.