US PATENT SUBCLASS 374 / 18
.~.~ By reflection (e.g., polished surface)

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.~.~ By reflection (e.g., polished surface) {1}
19  DF  .~.~.~> Sensed by instrument (e.g., photocell) {1}

DEFINITION

Classification: 374/18

By reflection (e.g., polished surface):

(under subclass 17) Subject matter wherein the light modifying characteristic is reflection from the specimen or an element in contact therewith.

(1) Note. Included herein are total internal reflection within the specimen and mirrors contacting the specimen.