Timing device
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United States of America Patent
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Jul 11, 2017
Grant Date -
Jan 10, 2013
app pub date -
Feb 11, 2011
filing date -
Feb 12, 2010
priority date (Note) -
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Abstract
The timing device is a lifetime monitor for indicating when the usable lifetime of a product has ended or for indicating the timing for regular usage of a product. The timing device has a timing initiator, a power supply in the form of a membrane zinc air battery and a visual or audible indicator. The timing initiator is a tear-off air blocking membrane which lets in air when the tear off film is removed. The timing device is capable of indicating a predetermined passage of time which is substantially independent of ambient temperature.
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