Freeze indicator

Details Freeze indicator Freeze indicator

1992-05-11

1993-08-31

Will, Thomas B.

Signals and indicators

Indicators

Temperature responsive or compensating means

374159, 426 88, G01K 532

Patent

active

052399427

ABSTRACT:
A freeze indicator comprising a frangible ampule containing a liquid which expands upon freezing, a dye soluble in the liquid and a nucleating agent, the nucleating agent and the liquid having substantially similar space groupings, the ampule being enclosed within a blister of transparent film, the blister being adhered to a backing, the inner surface of the blister being coating with an absorbent layer comprising a binder wettable by the liquid and a filler, whereby upon rupture of the ampule the liquid containing dye is absorbed by the absorbent layer thereby causing a color change in the absorbent layer visible through the transparent film.

REFERENCES:
patent: 2460215 (1949-01-01), Chase
patent: 3177843 (1965-04-01), Geocaris
patent: 3414415 (1968-12-01), Broad, Jr.
patent: 3702077 (1972-11-01), Szabo
patent: 4120818 (1978-10-01), Swindells et al.
patent: 4145918 (1979-03-01), Couch et al.
patent: 4191125 (1980-03-01), Johnson
patent: 4469452 (1984-09-01), Sharpless et al.
patent: 5111768 (1992-05-01), Larsson et al.

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