US PATENT SUBCLASS 374 / 19
.~.~.~ Sensed by instrument (e.g., photocell)

Current as of: June, 1999
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374 /   HD   THERMAL MEASURING AND TESTING

16  DF  TRANSFORMATION POINT DETERMINATION (E.G., DEW POINT, BOILING POINT) {6}
17  DF  .~ By change in optical property (e.g., transmission) {1}
18  DF  .~.~ By reflection (e.g., polished surface) {1}
19.~.~.~ Sensed by instrument (e.g., photocell) {1}
20  DF  .~.~.~.~> Controlling heating or cooling

DEFINITION

Classification: 374/19

Sensed by instrument (e.g., photocell):

(under subclass 18) Subject matter wherein the reflected light is sensed by an element responsive thereto.

(1) Note. Such an element is often a photocell.

SEE OR SEARCH CLASS

250, Radiant Energy,

573+, for a prephotocell systems having fluent material in its optical path.