US PATENT SUBCLASS 351 / 242
.~.~.~ Chromaticity type

Current as of: June, 1999
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351 /   HD   OPTICS: EYE EXAMINING, VISION TESTING AND CORRECTING

200  DF  EYE EXAMINING OR TESTING INSTRUMENT {7}
222  DF  .~ Subjective type {7}
239  DF  .~.~ Including test chart or target {5}
242.~.~.~ Chromaticity type

DEFINITION

Classification: 351/242

Chromaticity type:

(under subclass 239) Subject matter relating to polychromatic charts or plates used in color deficiency or color sensitivity test, the plates or charts exposing to the viewer s:graphic representations of different particular colors and/or varying intensity.

SEE OR SEARCH THIS CLASS, SUBCLASS:

237, for chart and/or target projection.