US PATENT SUBCLASS 250 / 484.2
.~.~ Requiring an additional energy source to cause luminescence

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}
484.2.~.~ Requiring an additional energy source to cause luminescence {2}
484.3  DF  .~.~.~> With thermally-stimulated phosphor
484.4  DF  .~.~.~> With optically-stimulated phosphor {1}

DEFINITION

Classification: 250/484.2

Requiring an additional energy source to cause luminescence:

(under subclass 483.1) Subject matter wherein the material which emits luminous energy requires another energy source to raise the energy level of the material to luminescence.