US PATENT SUBCLASS 283 / 84
.~.~ Overlaying vaporizable material revealing information

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}
83  DF  .~ And electrically conductive material {1}
84.~.~ Overlaying vaporizable material revealing information

DEFINITION

Classification: 283/84

Overlaying vaporizable material revealing information:

(under subclass 83) Subject matter wherein the electrically conductive material is layered, coated, or otherwise positioned over indicia or other information on the article and is composed of a substance which when subject to an electrical current vaporizes thereby revealing the indicia or other information.