Expiration indicator

Details Expiration indicator Expiration indicator

2007-03-13

2007-03-13

Verbitsky, Gail (Department: 2859)

Thermal measuring and testing

Temperature measurement

Composite temperature-related paramenter

C374S162000, C374S141000, C374S102000, C374S183000

Reexamination Certificate

active

10885217

ABSTRACT:
A simple recording device using a stable electric resistance heater in thermal contact with an irreversible color changing time temperature material relatively insensitive to room temperatures to show and record the cumulative time an electrical appliance, battery, tool, instrument has been used.The device may use a plurality of thick film carbon printed resistive heater with a thermal gradient in contact with the time temperature material or a simple adhesive calibrated time temperature film on a surface mounted stable resistor. The indicator is in parallel or series with the power switch.The time temperature material is in thermal contact with a constant temperature heater when used in fluctuating ambient temperature conditions.

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