Thermal measuring and testing – Temperature measurement – Mechanical
Reexamination Certificate
2005-01-04
2005-01-04
Bennett, G. Bradley (Department: 2859)
Thermal measuring and testing
Temperature measurement
Mechanical
C374S195000, C374S187000, C374S194000
Reexamination Certificate
active
06837620
ABSTRACT:
A sensor provides a persistent indication that it has been exposed to temperatures below a certain critical temperature for a predetermined time period. An element of the sensor made from shape memory alloy changes shape when exposed, even temporarily, to temperatures below the Austenitic start temperature Asand well into Martensite finish temperature Mfoff the shape memory alloy. The shape change of the SMA element causes the sensor to change between two readily distinguishable states. The sensor includes a one-way stop element that creates a persistent indication of the temperature history, allowing the sensor to be manufactured and stored at temperatures above the Austenitic temperature without causing the indication of an over-temperature event.
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Bennett G. Bradley
Grafe V. Gerald
Jagan Mirellys
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