US PATENT SUBCLASS 349 / 18
.~ Variable or rotatable retarder used with other retarders to produce filtering effects (Solc, Lyot, Partial)

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349 /   HD   LIQUID CRYSTAL CELLS, ELEMENTS AND SYSTEMS

1  DF  LIQUID CRYSTAL SYSTEM {9}
18.~ Variable or rotatable retarder used with other retarders to produce filtering effects (Solc, Lyot, Partial)

DEFINITION

Classification: 349/18

Variable or rotatable retarder used with other retarders to produce filtering effects (Solc, Lyot, Partial):

(under subclass 1) Subject matter wherein a liquid crystal element forms a variable or rotatable retarder which is combined with other retarders to form a tunable filter, such that the relative orientations of the retarders produce a precise output.