Thermal measuring and testing – Calorimetry
Reexamination Certificate
2007-10-31
2008-11-11
Gaudalupe-McCall, Yaritza (Department: 2841)
Thermal measuring and testing
Calorimetry
C374S010000
Reexamination Certificate
active
07448796
ABSTRACT:
A differential scanning calorimeter apparatus includes reference and sample cells and controlled temperature shields. The temperature of the shields is controlled such that baseline curvature is reduced by eliminating heat flow from the furnaces to their surroundings (quasi adiabatic conditions) and by controlling heat flow through a well defined solid state heat resistance between the furnaces and a temperature controlled heat sink. The temperature of each shield can be controlled independently to reduce differential heat flow over the whole temperature range of the scan, or maintained at a constant temperature for conventional power compensated DSC operation. The temperature/time profile for each shield can be controlled according to actual furnace temperature, obtained from an empty run, or stored in the computer memory and recalled for sample measurements.
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International Search Report and Written Opinion; Jun. 20, 2006; 10 pages.
Gaudalupe-McCall Yaritza
PerkinElmer LAS, Inc.
St. Onge Steward Johnston & Reens LLC
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