US PATENT SUBCLASS 250 / 485.1
.~.~ With light excluding casing having an aperture

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

472.1  DF  INVISIBLE RADIATION RESPONSIVE NONELECTRIC SIGNALLING {4}
483.1  DF  .~ Luminescent device {4}
485.1.~.~ With light excluding casing having an aperture

DEFINITION

Classification: 250/485.1

With light excluding casing having an aperture:

(under subclass 483.1) Subject matter wherein the structure includes a casing to enclose the material or has the (luminescent) material formed as a portion of the casing whereby visible light is excluded within the casing and an opening in the casing to permit the detection of luminous energy emitted by the material.