Precise critical temperature indicator and manufacturing method therefor
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United States of America Patent
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Aug 12, 2014
Grant Date -
Sep 8, 2011
app pub date -
Oct 21, 2009
filing date -
Oct 24, 2008
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Abstract
A precise critical temperature indicator is applied to small products requiring refrigeration or freezing to control the operation of a temperature sensor built into an integrated structure of a single body. A method for manufacturing said precise critical temperature indicator, wherein a plurality of development medium members and a plurality of development material members are opposed to each other, and blocking members are interposed therebetween to support the development medium members and the development material members separately from each other, the development medium members are provided with paths for moving development materials, or paths for movement of development materials can be shortened to adjust speed, and an indication unit is arranged to indicate the state of the development materials at an end or central portion of the development medium when the development materials are exposed to a critical temperature for a predetermined time period.
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