Optical: systems and elements – Holographic system or element – Authentication
Reexamination Certificate
2005-03-08
2005-03-08
Nguyen, Thong (Department: 2872)
Optical: systems and elements
Holographic system or element
Authentication
C359S022000, C283S086000, C283S093000, C430S010000
Reexamination Certificate
active
06865001
ABSTRACT:
Holographic and diffractive security devices and documents carrying security devices as well as system, apparatus, and method for making and using security devices. Security devices provide at least one type of security feature in form of secret, hidden, or covert security feature, not visible to a normal unaided human eye. Covert security features may be any graphic or symbolic representation. One or multiple security features may be provided on any single security device in any combination. Covert feature is revealed either when a decoder device is used with the security device, or when the security device is oriented and viewed in predetermined manner. Embodiments may provide a second overt or non-covert security device in the form of a diffractive or holographic image or graphic that is visible to the unaided eye without use of any decoder or special viewing conditions.
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Long Michael D.
Newcomb Diana
Ananian R. Michael
Dorsey & Whitney LLP
Lavarias Arnel C.
Nguyen Thong
Pacific Holographics Inc.
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