Patent ID: 8558707

Claim:
A passive temperature-sensitive thermal cutoff fuse Radio Frequency Identification (RFID) tag requiring no internal power, comprising: a bimorph strip is constructed from two layers composed of two different materials; said bimorph strip is positioned on a tag substrate; a plurality of thin conductive bridges, being positioned on said tag substrate in proximity to and apart from said bimorph strip, are connected to form a one-time breakable nonresetable fusible link conductive bridge fuse circuit having no internal power and which is normally closed; each of said plurality of thin conductive bridges corresponding to a single temperature set point, and at least one of said thin conductive bridges has at least one notch to aid in the breakage of the conductive bridge fuse circuit; said two different materials having a difference in coefficients of thermal expansion so that said bimorph strip bends in a first given direction when a first one of said layers is exposed to a first one of a plurality of predetermined set point temperatures and in an opposite direction when a second one of said layers is exposed to a second one of said plurality of predetermined set point temperatures; said plurality of thin conductive bridges being configured to be physically broken by said bimorph strip bending after at least one of said plurality of predetermined set point temperatures has been reached; said RFID tag being positioned among a plurality of stored objects that are located in the vicinity of a sensor; and said bimorph strip breaking one of said plurality of thin conductive bridges when said at least one of the plurality of predetermined set point temperatures is reached to cause said conductive bridge fuse circuit to become an open one-time broken nonresetable circuit detectable by said sensor.