Temperature indicator

Details Temperature indicator Temperature indicator

1979-07-06

1981-07-28

Gron, Teddy S.

Signals and indicators

Indicators

Temperature responsive or compensating means

73358, 116217, 252408, G01K 1106, G01K 1118, G01K 1300

Patent

active

042804418

ABSTRACT:
A temperature indicator including a backing strip with an embossed well stamped therein is provided. The well contains a matrix carrier which is impregnated with a thermally responsive fusible chemical. The bottom of the well is painted a bright color. The impregnated matrix is placed over and substantially covers the colored bottom of the well. The top of the well is covered by a transparent film. At a temperature below a predetermined level, the colored bottom of the well is substantially invisible due to the impregnated matrix being opaque, and at temperatures above such predetermined level, the colored bottom of the well is clearly visible due to the transparency of the impregnated matrix upon melting of the chemical.

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patent: 3926368 (1975-12-01), Geen
patent: 4154106 (1979-05-01), Inoue et al.
patent: 4232552 (1980-11-01), Hof et al.

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