Humidity sensitive cutoff fuse

Communications: electrical – Condition responsive indicating system – Specific condition

Reexamination Certificate

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Details

C340S500000, C340S540000, C340S572100, C340S584000, C310S307000, C310S332000

Reexamination Certificate

active

07956759

ABSTRACT:
A humidity-sensitive cutoff fuse RFID tag is provided with a bimorph element and thin conductive bridges positioned on an RFID tag substrate that can react to all changes in storage humidity conditions. The bimorph element is configured and positioned so that when it bends in response to one or more predetermined humidity levels, the bimorph element will break one of the conductive bridges and cause an open circuit that can be detected when the RFID tag is interrogated by a sensor. The humidity-sensitive cutoff fuse RFID tag can provide humidity information about numerous stored objects such as food, medicine, chemicals, batteries, explosives and munitions. Multiple humidity conductive bridge cutoff fuse RFID tag arrangements and methods for notifying the user when a predetermined storage humidity limit has been reached with a passive humidity-sensitive cutoff fuse RFID tag are provided. Since it does not require power to operate, the cutoff fuse is suitable for monitoring e long-term storage condition.

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