Moisture Indicator and Time Indicator
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United States of America Patent
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Issued Date -
Oct 9, 2008
app pub date -
Dec 27, 2007
filing date -
Dec 28, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides a film or a sheet-like moisture indicator that allows one to visually recognize moisture by changing from a non-transparent color such as white to transparent when it is moistened. The present invention also provides a film or a sheet-like time indicator that allows one to visually recognize the passage of a predetermined length of time by becoming transparent when it is moistened. The indicator of the invention has a water-soluble, non-transparent layer formed of a non-transparent, dry film composition, which comprises a water-soluble cellulose derivative, as well as a water-soluble compound containing at least one metal selected from the group consisting of monovalent, divalent, and trivalent metals. The indicator may further comprise, on the water-soluble, non-transparent layer, a water-soluble transparent layer, a water-insoluble support layer, and/or an attachment layer (an adhesive layer and a release paper therefor) for attaching the indicator to a test target.
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