(under the class definition) Subject matter including polarizing apparatus to examine visible light or to examine articles or material by means of visible polarized light; or including apparatus to compare, when polarization is involved, light, per se, or light transmitted through or reflected from an article or material with a light standard.
SEE OR SEARCH THIS CLASS, SUBCLASS:
30+, for crystal or gem examination where polarized light is involved.
33+, for stress-strain examination of articles or material.
351, for light interference measuring or testing involving polarized light.
SEE OR SEARCH CLASS
250, Radiant Energy, 204, for photoelectric, servo electric systems of the visible light type which utilize polarized light; and subclass 225 for preoptical visible light systems of the polarized light type where no light or article testing is involved.
359, Optics: Systems (Including Communication) and Elements,
437, for scales or indicia reading which utilize a polarizer element; and subclasses 483+ for optical elements of the polarizer type.
362, Illumination,
19, which includes polarizers used with general illumination devices.
