US PATENT SUBCLASS 349 / 174
.~.~.~ Antiferroelectric

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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  DF  .~.~ Within chiral smectic phase (includes ferroelectric) {2}
174.~.~.~ Antiferroelectric

DEFINITION

Classification: 349/174

Antiferroelectric:

(under subclass 172) Subject matter wherein the chiral smectic material has two hysteresises; i.e., three stable states.