US PATENT SUBCLASS 374 / 106
.~.~.~.~ Permanent visual indication (i.e., irreversible)

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

100  DF  TEMPERATURE MEASUREMENT (E.G., THERMOMETER) {13}
101  DF  .~ Composite temperature-related paramenter {3}
102  DF  .~.~ Time-temperature relationship (e.g., integral, deterioration, change) {4}
104  DF  .~.~.~ Peak (maximum or minimum) with respect to time {2}
106.~.~.~.~ Permanent visual indication (i.e., irreversible)

DEFINITION

Classification: 374/106

Permanent visual indication (i.e., irreversible):

(under subclass 104) Subject matter wherein the determination is made using an arrangement which changes with a change in temperature in only one direction, i.e. restoring the temperature to its initial value does not restore the arrangement to its original condition.

(1) Note. Included herein are arrangements having color change, fusible, or diffusion properties.

SEE OR SEARCH THIS CLASS, SUBCLASS:

160, for a reversible fusible thermometer.

161+, for a reversible optical property thermometer.