Signals and indicators – Indicators – Temperature responsive or compensating means
Patent
1980-05-06
1982-06-08
Gron, Teddy S.
Signals and indicators
Indicators
Temperature responsive or compensating means
23230R, 116217, 116219, 252408, 422 56, 422 58, 422119, 374160, 374161, 374 4, G01K 1106, G01K 1116, G01K 1118, G01K 120
Patent
active
043333397
ABSTRACT:
A novel temperature indicator having a cover layer and including a backing strip with an embossed well stamped therein is provided (in the alternative, the cover layer may be embossed) to form a pocket. The well may contain a matrix carrier which is impregnated with a thermally responsive fusible chemical. The bottom of the well is painted a bright color. If employed, 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. The matrix may be eliminated if the backing strip and/or cover layer is air permeable and if the chemical entirely fills the pocket. The latter may be achieved if, after the chemical is placed in the pocket during manufacture, the well is heated beyond the melting point of the chemical and simultaneously exposed to vacuum.
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McNeely Gerald W.
Tummers Gerardus L. J.
Akzona Incorporated
Falk Robert H.
Gron Teddy S.
Wendel Charles A.
Young Francis W.
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