US PATENT SUBCLASS 349 / 181
.~.~.~ Having particular birefringence or retardation


Current as of: June, 1999
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349 /   HD   LIQUID CRYSTAL CELLS, ELEMENTS AND SYSTEMS

167  DF  WITH SPECIFIED NONCHEMICAL CHARACTERISTIC OF LIQUID CRYSTAL MATERIAL {6}
177  DF  .~ Within nematic phase {2}
179  DF  .~.~ Twisted (or chiral) nematic or supertwisted nematic {2}
181.~.~.~ Having particular birefringence or retardation


DEFINITION

Classification: 349/181

Having particular birefringence or retardation:

(under subclass 179) Subject matter wherein the characteristic recited is a particular value for the difference between the ordinary and the extraordinary indexes of refraction or that difference multiplied by the layer thickness for the twisted or supertwisted nematic material.