Hidden Holograms and uses thereof

Details Hidden Holograms and uses thereof Hidden Holograms and uses thereof

1996-12-13

1998-11-17

Henry, Jon W.

Optical: systems and elements

Holographic system or element

Authentication

359 1, 283901, 283903, 283 86, 283 94, 264 134, 264134, G03H 102, B42D 1500, B42D 1510, B32B 300

Patent

active

058384669

ABSTRACT:
Replicas of a surface relief hologram, or other light diffraction pattern, are coated with a transparent material having substantially the same refractive index as the holograms to conform to the surface relief patterns and thus hide the hologram. The coating is pealed by hand off of the surface relief pattern in order to reveal an image visible in light reflected from the hologram. Such hidden holograms can be attached to a greeting card to reveal a greeting when the coating is removed, attached to pages of magazines or books to carry an advertising message, and the like. Other uses include making lottery tickets or other indications of a prize from such holograms, since the indication of any prize won by the holder remains hidden until the coating is pulled off, even though the coating is optically transparent.

REFERENCES:
patent: 4315665 (1982-02-01), Haines
patent: 4837061 (1989-06-01), Smits et al.
patent: 4913858 (1990-04-01), Miekka et al.
patent: 4921319 (1990-05-01), Mallik
patent: 5037101 (1991-08-01), McNulty
patent: 5044707 (1991-09-01), Mallik
patent: 5085514 (1992-02-01), Mallik et al.
patent: 5116548 (1992-05-01), Mallik et al.
patent: 5145212 (1992-09-01), Mallik
patent: 5500765 (1996-03-01), Eichenlaub
patent: 5591527 (1997-01-01), Lu

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