US PATENT SUBCLASS 283 / 89
.~.~.~ Ultraviolet filter

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}
89.~.~.~ Ultraviolet filter

DEFINITION

Classification: 283/89

Ultraviolet filter:

(under subclass 87) Subject matter wherein the filter allows or permits electromagnetic radiation in the ultraviolet range of the electromagnetic spectrum to pass therethrough.