US PATENT SUBCLASS 359 / 2
.~ Authentication

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

1  DF  HOLOGRAPHIC SYSTEM OR ELEMENT {16}
2.~ Authentication

DEFINITION

Classification: 359/2

Authentication:

(under subclass 1) Subject matter wherein a hologram is used to provide proof that a document is not counterfeit or to make a document copy-proof.

SEE OR SEARCH CLASS

283, Printed Matter, for document authentification with nominally recited holograms.

380, Cryptography,

54, for modifying an optical image in order to conceal or reveal a hidden message.