US PATENT SUBCLASS 313 / 117
.~ Light valve or obscuring means


Current as of: June, 1999
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313 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES

110  DF  WITH OPTICAL DEVICE OR SPECIAL RAY TRANSMISSIVE ENVELOPE {5}
117.~ Light valve or obscuring means


DEFINITION

Classification: 313/117

(under subclass 110) Devices in which the optical device is a light valve, or a light shield or other light obscuring means for preventing transmission of light.

SEE OR SEARCH THIS CLASS, SUBCLASS:

364+, for cathode ray devices provided with light valves.

SEE OR SEARCH CLASS

359, Optics: Systems (Including Communication) and Elements,

227+, and 238+ for light valves, per se.