US PATENT SUBCLASS 283 / 91
.~.~.~ Specific spectral transmittance or reflectance

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}
91.~.~.~ Specific spectral transmittance or reflectance

DEFINITION

Classification: 283/91

Specific spectral transmittance and reflectance:

(under subclass 87) Subject matter wherein the printed matter is provided with means which allows or permits only a specific frequency or range of frequencies of electromagnetic radiation to pass therethrough and is designed or structured to cause a specific frequency or range of frequencies of electromagnetic radiation to bounce off or rebound, i.e., reflect, from the means of the printed matter.