US PATENT SUBCLASS 349 / FOR 135
.~.~ Flurescent additive (359/97)

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349 /   HD   LIQUID CRYSTAL CELLS, ELEMENTS AND SYSTEMS

193  DF  LIQUID CRYSTAL OPTICAL ELEMENT {21}
FOR 134  DF  .~ Variable absorption of light due to an additive in the liquid crystal material (359/96) {2}
FOR 135.~.~ Flurescent additive (359/97)

DEFINITION

Classification: 349/FOR.135

Fluorescent additive:

Foreign Art Colleection wherein the liquid crystal material is mixed with a substance which fluoresces.