Temperature sensors

Details Temperature sensors Temperature sensors

1994-03-24

1997-04-22

Gutierrez, Diego F.F.

Signals and indicators

Indicators

Temperature responsive or compensating means

374155, 374160, 99342, G01K 1106, G01K 114

Patent

active

056221371

ABSTRACT:
A low cost, disposable temperature sensor comprising a non-porous rigid substrate having a colored patch of a contrasting color, covered by a thermochromic material which obscures the colored patch. The thermochromic material, which has a color in the visual range which completely obscures the underlying colored patch, is selected to have a melting or solidus point such that when the material is exposed to a predetermined temperature, the thermochromic material permanently changes to a relatively transparent color whereby the colored patch on the substrate is rendered visible through the thermochromic material. A transparent cover or film encapsulates the thermochromic material place on the substrate. In a preferred embodiment of the invention, the substrate comprises a paperboard product, and includes printed indicia for making a permanent record. The sensor has particular utility in measuring safe cooking temperature of food,

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