US PATENT SUBCLASS 33 / 366.16
.~.~.~.~ Having light or radiant energy detecting circuit control element

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

300  DF  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
365  DF  .~ Level or plumb, terrestrial gravitation responsive {9}
366.11  DF  .~.~ Electrically actuated signal or indicator {9}
366.15  DF  .~.~.~ Fluent sensor {4}
366.16.~.~.~.~ Having light or radiant energy detecting circuit control element

DEFINITION

Classification: 33/366.16

Having light or radiant energy detecting circuit control element:

(under subclass 366.15) Subject matter including a circuit control element and wherein the control element is responsive to radiation incident thereon after passage through some portion of the fluent material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

366.23, for this subject matter wherein the control element is not located in a fluid.

SEE OR SEARCH CLASS

356, Optics, Measuring and Testing,

139.1, for producing a quantitative indication of angle of inclination from level or vertical by optical photodetection.