US PATENT SUBCLASS 349 / 172
.~.~ Within chiral smectic phase (includes ferroelectric)

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}
171  DF  .~ Within smectic phase {1}
172.~.~ Within chiral smectic phase (includes ferroelectric) {2}
173  DF  .~.~.~> Greyscale resulting from liquid crystal property other than solely Smectic A
174  DF  .~.~.~> Antiferroelectric

DEFINITION

Classification: 349/172

Within chiral smectic phase (includes ferroelectric):

(under subclass 171) Subject matter wherein the characteristic recited is that of a liquid crystal within the smectic mesophase wherein the liquid crystal molecules are twisted from one substrate to the other.