US PATENT SUBCLASS 349 / FOR 133
.~ Variable diffraction (359/95)

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349 /   HD   LIQUID CRYSTAL CELLS, ELEMENTS AND SYSTEMS

193  DF  LIQUID CRYSTAL OPTICAL ELEMENT {21}
FOR 133.~ Variable diffraction (359/95)

DEFINITION

Classification: 349/FOR.133

Variable diffraction:

Foreign Art Collection wherein changes in the strength of an electric field applied to the liquid crystal device result in changes in the spacing of a grating formed in the liquid crystal material.