Granted Patent
Utility
US 4,779,898 · App. 07/088,144
Thin film optically variable article and method having gold to green color shift for currency authentication
Inventors:
Peter H. Berning, Roger W. Phillips
Patented Case
View Patent ↗
Granted: Oct 25, 1988
Filed: Aug 21, 1987
Inventors
Peter H. Berning
Roger W. Phillips
Assignee (at issue)
Optical Coating Laboratory, 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.