Time duration indicator systems, and also products containing such indicator systems having a limited duration of use or life
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United States of America Patent
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-
May 1, 1990
Grant Date -
N/A
app pub date -
Dec 3, 1986
filing date -
Dec 16, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Time duration indicator systems comprising a porous inert carrier and a volatile liquid, capable of reversibly changing the visual properties of the carrier. Such indicator systems can be used for products having a limited duration of use or life.
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