Chipless radio frequency identification (RFIT) for tamper evidence
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United States of America Patent
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Feb 19, 2019
Grant Date -
Nov 16, 2017
app pub date -
May 13, 2016
filing date -
May 13, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A radio frequency identification (RFID) tag or transponder that outputs a first signal when a product or product package is sealed. During one particular use, unsealing the product or product package disables the RFID tag, such that no active second signal is output (i.e., the second signal is a passive second signal). In another particular use, unsealing the product or product package removes one or more resonators of a multiresonator such that the second signal is an active second signal that is different from the first signal. The RFID tag need not be visible to identify whether the product or product package is in a sealed state or an unsealed state.
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