US PATENT SUBCLASS 283 / 90
.~.~.~ Polarized

Current as of: June, 1999
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283 /   HD   PRINTED MATTER

72  DF  HAVING REVEALABLE CONCEALED INFORMATION, FRAUD PREVENTER OR DETECTOR, USE PREVENTER OR DETECTOR, OR IDENTIFIER {15}
85  DF  .~ Utilizing electromagnetic radiation {4}
87  DF  .~.~ And incorporated radiation filter {4}
90.~.~.~ Polarized

DEFINITION

Classification: 283/90

Polarized:

(under subclass 87) Subject matter wherein the filter allows

polarized visible light to pass therethrough only when the filter is properly oriented relative to the angle of polarization of the light.