Granted Patent
Utility
US 4,626,445 · App. 06/797,167
Method of manufacturing an optical interference authenticating device
Inventors:
Jerzy A. Dobrowolski, Allan J. Waldorf
Patented Case
View Patent ↗
Granted: Dec 2, 1986
Filed: Nov 12, 1985
Inventors
Jerzy A. Dobrowolski
Allan J. Waldorf
Assignee (at issue)
Canadian Patents and Development Limited
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.