Disposable ophthalmic/medical apparatus with timed color change indication
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United States of America Patent
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Mar 5, 2013
Issued Date -
N/A
app pub date -
Jul 16, 2009
filing date -
Nov 30, 2006
priority date (Note) -
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Abstract
A disposable ophthalmic or medical apparatus 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 apparatus should no longer be used.
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