Apparatus with timed color change indication
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United States of America Patent
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Sep 15, 2015
Grant Date -
Oct 17, 2013
app pub date -
Feb 28, 2013
filing date -
Nov 30, 2006
priority date (Note) -
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Abstract
An apparatus with time controlled color change indication comprises an apparatus includes a disposable, limited or restricted use product and an oxygen sensing color changeable dye disposed on a portion of the apparatus, the dye being translucent or having a first color upon application and for a defined time thereafter and the dye changing color after exposure to oxygen for the defined time. For example, a packaging for containing a product for human consumption has a portion with a color changeable dye disposed thereon. The dye changes color after being exposed to oxygen for a controlled and predetermined period of time indicating that the product for human consumption should no longer be consume or has decreased in freshness, quality of taste or potency.
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