US PATENT SUBCLASS 252 / 299.61
.~.~ Including heterocyclic ring

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

299.01  DF  LIQUID CRYSTAL COMPOSITIONS {7}
299.6  DF  .~ Containing nonsteryl liquid crystalline compound of specified structure {7}
299.61.~.~ Including heterocyclic ring

DEFINITION

Classification: 252/299.61

Including heterocyclic ring:

(under subclass 299.6) Compositions wherein the liquid crystal compound has a ring of three or more members, at least one of which is carbon and one or more members selected from nitrogen or chalcogen.