Human-readable, bi-state environmental sensors based on micro-mechanical membranes
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United States of America Patent
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Dec 13, 2011
Grant Date -
Dec 1, 2011
app pub date -
Mar 31, 2008
filing date -
Mar 31, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An environmental sensing device includes an interferometric modulator which permanently actuates, in a visually-detectable manner, in response to being exposed to a predetermined environmental threshold or condition. The device can include a reactive layer, coating, or proof mass disposed on a movable member of the interferometric modulator. The reactive layer, coating, or proof mass can expand, contract, bend, or otherwise move when exposed to a predefined chemical, level of humidity, temperature threshold, type of radiation, and/or level of mechanical shock, causing the interferometric modulator to collapse and permanently indicate such exposure.
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