US PATENT SUBCLASS 349 / 178
.~.~ Negative dielectric anisotropy only

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}
178.~.~ Negative dielectric anisotropy only

DEFINITION

Classification: 349/178

Negative dielectric anisotropy only:

(under subclass 177) Subject matter wherein the nematic liquid crystal material aligns perpendicular to an applied electric field.

(1) Note. Material which exhibits both positive and negative dielectric anisotropy is excluded from this subclass. For such excluded subject material, see SEARCH THIS CLASS, SUBCLASS below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

170, for the use of material which exhibits both positive and negative dielectric anisotropy.