US PATENT SUBCLASS 356 / 131
.~.~ With servo controlled optical member

Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

128  DF  REFRACTION TESTING (E.G., REFRACTOMETERS) {5}
130  DF  .~ Differential {1}
131.~.~ With servo controlled optical member {1}
132  DF  .~.~.~> Reflective optical member

DEFINITION

Classification: 356/131

(under subclass 130) Subject matter including an optical member in the path of the light beam, and servo-controlled means responsive to the photoelectric device to control the optical member in response to the light received by the photoelectric device.

SEE OR SEARCH CLASS

137, Fluid Handling,

2+, and 93 for processes and apparatus which may control the flow of the fluids handled by means of a refraction test upon the fluid controlled.

250, Radiant Energy,

204, for optical elements which are adjusted to balance light brightness in plural paths to a photoelectric servo-system.

318, Electricity: Motive Power Systems, 18+, for motors controlled by servo systems not elsewhere provided, and subclass 480 for motors controlled by radiant energy.