US PATENT SUBCLASS 283 / 87
.~.~ And incorporated radiation 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.~.~ And incorporated radiation filter {4}
88  DF  .~.~.~> Infrared filter
89  DF  .~.~.~> Ultraviolet filter
90  DF  .~.~.~> Polarized
91  DF  .~.~.~> Specific spectral transmittance or reflectance

DEFINITION

Classification: 283/87

And incorporated radiation filter:

(under subclass 85) Subject matter provided with a filter in the form of means or structure which allows or permits either: (a) only a specific range of frequencies of electromagnetic radiation to pass therethrough; or (b) polarized visible light to pass therethrough only when the filter is properly oriented relative to the angle of polarization of the light and wherein either (a) or (b), the filter is integral with or permanently attached or associated with the printed matter.

SEE OR SEARCH CLASS

359, Optics: Systems (Including Communication) and Elements, appropriate subclasses for optical filters or optical systems or elements utilizing various types of radiation filters.