Dual temperature indicator

Details Dual temperature indicator Dual temperature indicator

1992-04-17

1993-06-01

Cuchlinski, Jr., William A.

Thermal measuring and testing

Temperature measurement

Composite temperature-related paramenter

374106, 374162, 374104, 374201, 374204, 116216, G01K 300, G01K 1100, G01K 1112, G01K 508, G01K 520

Patent

active

052153789

ABSTRACT:
A dual temperature indicator providing visual indications when exposed to predetermined high or low temperatures. The indicator has a bulb with a capillary tube and an attached high temperature indicator structure. The bulb has a first liquid which also fills a predetermined portion of the tube. A separating substance and a second miscible liquid further fills a predetermined portion of the remainder of the tube. At a predetermined low temperature, the liquid in the bulb contracts causing the separating substance and a portion of the second liquid to move into the bulb to produce a visible color change. The high temperature indicator structure has an indicating member in contact with the capillary tube end and which provides a visual indication at a predetermined high temperature when the liquids expand upon an environmental temperature increase.

REFERENCES:
patent: 2415309 (1947-02-01), Stone
patent: 3233459 (1966-02-01), Gleason et al.
patent: 3717035 (1973-02-01), Klingler et al.
patent: 3745831 (1973-07-01), Rothstein et al.
patent: 4083250 (1978-04-01), Goff et al.
patent: 4457252 (1984-07-01), Manske
patent: 4457253 (1984-07-01), Manske
patent: 4647224 (1987-03-01), Holm et al.

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