Signals and indicators – Indicators – Temperature responsive or compensating means
Reexamination Certificate
2003-04-24
2008-08-26
Smith, R. A. (Department: 2841)
Signals and indicators
Indicators
Temperature responsive or compensating means
C374S106000
Reexamination Certificate
active
07415939
ABSTRACT:
It's a device whose purpose is to monitor the storage and indicate that a frozen product has been subjected to a thermal variation, with temperature rise, causing the fusion and liquefaction of a fluid (H) contained in the indicator. The indicator comprises a hollow, cylindrical tube (2) with an open end (3), featuring a releasable cap (17) and a closed end (4), with a slidable piston (5) inside the tube (2). A compartment (C1), inside the tube (2), placed between the piston (5) and the end (4), is fulfilled with a compressed means like a fluid (0)/spring (M), and a compartment (C2) placed between the piston (5) and the end (3), is fulfilled with the fluid (H), frozen, in the solid state. Upon the thawing of the product, the fluid (H) also thaws, escaping the compartment (C2) and allowing the movement of the piston (5), pushed by the fluid (0). The movement of the piston (5) is irreversible and constitutes the indicator's visual indication revealing that the product has been thaw.
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