Device for visually indicating a pressure or temperature conditi

Details Device for visually indicating a pressure or temperature conditi Device for visually indicating a pressure or temperature conditi

1982-05-06

1988-12-27

Cuchlinski, Jr., William A.

Thermal measuring and testing

Temperature measurement

Nonelectrical, nonmagnetic, or nonmechanical temperature...

116219, G01K 1108

Patent

active

047937173

ABSTRACT:
Indicating device suitable for visibly indicating conditions such as the application of force or pressure or the exposure to a critical temperature. The device includes a porous pad containing an indicating dyed chemical, a wick maintained in spaced relation to the pad and a snap action activating means. The activating means forces the wick into contact with the pad and dyed chemical migration provides visible indication of the application of force or pressure. The indicating dyed chemical may be frozen and the activating means engaged. Upon reaching a critical temperature the frozen chemical melts allowing dye migration into the wick and a visible indication of exposure to the critical temperature.

REFERENCES:
patent: 3465590 (1969-09-01), Kluth
patent: 3597976 (1971-08-01), Fryar
patent: 3615719 (1971-10-01), Michel
patent: 3665770 (1972-05-01), Sagi
patent: 3922917 (1975-12-01), Ayres
patent: 3954011 (1976-05-01), Manske
patent: 3962920 (1976-06-01), Manske

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