US PATENT SUBCLASS 283 / 92
.~.~ On incorporated fluorescent material

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}
92.~.~ On incorporated fluorescent material

DEFINITION

Classification: 283/92

On incorporated fluorescent material:

(under subclass 85) Subject matter wherein the printed matter is provided with material which when irradiated by electromagnetic radiation will emit electromagnetic radiation, generally of a different frequency other than that of the irradiating frequency.