Granted Patent
Utility
US 4,920,006 · App. 07/031,315
Colored metal alloy/oxynitride coatings
Inventor:
Frank H. Gillery
Patented Case
View Patent ↗
Granted: Apr 24, 1990
Filed: Mar 26, 1987
Inventor
Frank H. Gillery
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.