US PATENT SUBCLASS 349 / FOR 132
.~ Variable index of refraction (359/94)

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349 /   HD   LIQUID CRYSTAL CELLS, ELEMENTS AND SYSTEMS

193  DF  LIQUID CRYSTAL OPTICAL ELEMENT {21}
FOR 132.~ Variable index of refraction (359/94)

DEFINITION

Classification: 349/FOR.132

Variable index of refraction:

Foreign Art Collection wherein the ratio of the velocity of light in air to the velocity of light in a refractive material for a given wavelength is controllable through the liquid crystal device.