US PATENT SUBCLASS 250 / 227.21
.~.~.~ With light chopping or modulation

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
216  DF  .~ Optical or pre-photocell system {11}
227.11  DF  .~.~ Light conductor {14}
227.21.~.~.~ With light chopping or modulation {1}
227.22  DF  .~.~.~.~> Keyboard or other manual switch controlled

DEFINITION

Classification: 250/227.21

With light chopping or modulation:

(under subclass 227.11) Subject matter wherein means are provided for varying the intensity of the light transmitted to the photocell from substantially zero to substantially maximum intensity as a function of time.

(1) Note. The chopping or modulating means may be for example, electromechanical or electrooptical, an object under inspection or analysis, or a keyboard controlled optical shutter, for example.

SEE OR SEARCH CLASS

359, Optics: Systems (Including Communication) and Elements, appropriate subclasses for light modulators/chopping devices, per se, as well as for optical logic devices.