Granted Patent
Utility
US 5,596,402 · App. 08/607,919
Viewing device and method for ascertaining simultaneously optical color shift characteristics of an optically variable device
Inventors:
Charles T. Markantes, Roger W. Phillips
Patented Case
View Patent ↗
Granted: Jan 21, 1997
Filed: Feb 28, 1996
Inventors
Charles T. Markantes
Roger W. Phillips
Assignee (at issue)
Flex Products, 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.