US PATENT SUBCLASS 374 / 17
.~ By change in optical property (e.g., transmission)

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.~ By change in optical property (e.g., transmission) {1}
18  DF  .~.~> By reflection (e.g., polished surface) {1}

DEFINITION

Classification: 374/17

By change in optical property (e.g., transmission):

(under subclass 16) Subject matter wherein the test is performed by determining a change in a light modifying characteristic of the test specimen or an element in contact therewith.