05142383 is referenced by 160 patents and cites 6 patents.

Non-continuous reflective hologram or diffraction grating devices are provided in various forms for authenticating documents and things, such as those that contain visual information desired to be protected from alteration. Examples of such information include written personal data and photograph on a passport, driver's license, identity card, transportation pass, and the like. The reflective discontinuous hologram or diffraction device is formed in a pattern that both permits viewing the protected information through it and the viewing of an authenticating image or other light pattern reconstructed from it in reflection. The same master hologram or diffraction grating is made into distinct authenticaton devices by forming replicas thereof that have different patterns of reflective material which form distinct indicia, such as a different alpha-numeric character.

Title
Holograms with discontinuous metallization including alpha-numeric shapes
Application Number
470121
Publication Number
5142383
Application Date
April 1, 1991
Publication Date
August 25, 1992
Inventor
Donald W Mallik
North Tarrytown
NY, US
Agent
Majestic Parsons Siebert & Hsue
Assignee
American Banknote Holographics
NY, US
IPC
B42D 15/00
B44F 1/12
G03H 1/02
G02B 5/18
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