US PATENT SUBCLASS 250 / 488.1
.~.~.~ Plural planar layer type

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}
487.1  DF  .~.~ With optical member of material to directly modify luminous energy {1}
488.1.~.~.~ Plural planar layer type

DEFINITION

Classification: 250/488.1

Plural planar layer type:

(under subclass 487.1) Subject matter wherein the structure is an integral unit formed of plural, flat, sheetlike materials, one of the sheets containing luminescent material.

(1) Note. A coating is considered a layer for this subclass.