Thermal measuring and testing – Temperature measurement – Composite temperature-related paramenter
Patent
1985-09-16
1986-07-22
Frankfort, Charles
Thermal measuring and testing
Temperature measurement
Composite temperature-related paramenter
374162, 116207, G01K 1112
Patent
active
046015884
ABSTRACT:
The present invention provides a temperature-indicating sheet which, when exposed to temperatures higher than the prescribed temperature in temperature-control for the common low-temperature preserved goods, changes in color according to the exposure temperature and time. This object is attained by arranging one component which melts at the prescribed temperature and a substance which irreversibly changes in color in contact with said component through a membrane permeable to the component. The sheet of the present invention comprises a component which melts at the prescribed temperature, a substance which changes in color in contact with the component and a membrane permeable to the molten component, said component being included in microcapsules which can be broken by outer pressure at a temperature used, and in which the component and the substance are arranged at the opposite sides with respect to the membrane.
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Nakai Makoto
Ono Tomoyoshi
Takahara Ichiro
Frankfort Charles
Matsumoto Kosan Kabushiki Kaisha
Will Thomas B.
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