Accession Number : ADD003779

Title :   Irreversible Warmup Indicator.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C

Personal Author(s) : Klimas,Mary G ; Swindells,Frank E

Report Date : 10 Aug 1976

Pagination or Media Count : 19

Abstract : The application describes a device for indicating irreversibly by means of color change that temperatures equal to or above 7 C, 10 C, or 13 C have occurred. A container which has an orifice therein is filled with a liquid which freezes at the temperature to be monitored. A dye is dissolved in the liquid. The orifice is placed in proximity to an indicating paper. When the container is activated by freezing, any increase in temperature after activation causes the liquid to melt, expand and escape through the orifice contacting the indicating paper thereby dying the paper and producing an irreversible signal.

Descriptors :   *Patent applications, *Temperature sensitive elements, Irreversible processes, Liquids, Freezing, Dyes, Indicators, Melting point

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE