Radio frequency identification device with visual indicator
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United States of America Patent
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Jun 19, 2007
Grant Date -
Jul 6, 2006
app pub date -
Dec 29, 2004
filing date -
Dec 29, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An RFID device includes a chip, an antenna operatively coupled to the chip, and a visual indicator operatively coupled to the chip. The visual indicator provides a visual indication of an operative state of the device. The visual indication may be human readable and/or machine readable, and may provide visual indication that is dependent on a change in an operative state of the device. The operative state that triggers the visual indication may include a state in which the chip has temporarily or permanently been rendered inoperative or disabled, that is, in which the chip no longer responds to, or otherwise interacts with, ordinary incoming RF signals such as from a device reader. The visual indicator may be included in a display that functions by any of a variety of suitable mechanisms, such as by use of electrochromic materials, thermochromic materials, liquid crystals, or chemically-reactive materials.
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