US PATENT SUBCLASS 250 / 231.19
.~.~.~.~ Pressure-responsive light valves

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}
229  DF  .~.~ Light valve (e.g., iris diaphragm) {3}
231.1  DF  .~.~.~ Actuated by dynamic external physical quantity {4}
231.19.~.~.~.~ Pressure-responsive light valves

DEFINITION

Classification: 250/231.19

Pressure-responsive light valves:

Subject matter under 231.1 wherein the dynamic external mechanical force sensed is pressure ((P) = F/A where F = a Newtonian type force and A = Area over which the force is applied) applied to the means in the optical path for varying the amount of light to reach the photocell(s).

SEE OR SEARCH CLASS

73, Measuring and Testing,

705, for photoelectric fluid pressure gauges.