US PATENT SUBCLASS 349 / FOR 143
.~.~ In cholesteric phase (359/105)


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349 /   HD   LIQUID CRYSTAL CELLS, ELEMENTS AND SYSTEMS

193  DF  LIQUID CRYSTAL OPTICAL ELEMENT {21}
FOR 141  DF  .~ Cell containing liquid crystal of specified composition (359/103) {3}
FOR 143.~.~ In cholesteric phase (359/105)


DEFINITION

Classification: 349/FOR.143

In cholesteric phase:

Foreign Art Collection wherein the enclosed liquid crystal material is in a mesophase having parallel molecular long axes within a given plane and having the additional characteristic that as one moves to successive planes in a direction perpendicular to the planes, the molecular long axes remain mutually parallel but rotate progressively about the direction of travel.