Thermal measuring and testing – Thermal gravimetric analysis
Reexamination Certificate
2005-12-27
2008-08-26
Verbitsky, Gail (Department: 2855)
Thermal measuring and testing
Thermal gravimetric analysis
C374S141000, C374S208000, C436S908000, C236S04400R
Reexamination Certificate
active
07416328
ABSTRACT:
Systems and methods for minimizing extraneous forces and calculating corrected weights of samples based on buoyancy factors for a thermogravimetric analyzer (TGA). The TGA includes a balance chamber and a furnace configured to heat a sample. A null balance is provided in the balance chamber and is used to measure the sample weight change during heating. The furnace includes a cylinder open at the top to receive a sample. The bottom of the cylinder is closed except for a small hole that allows a thermocouple to pass through. An infrared heat source may be provided to heat the cylinder. The balance chamber can be thermally isolated from the furnace using an actively cooled plate and a system of heat shields disposed between the furnace and balance chamber. A thermocouple disk is further provided to limit gas flow in the furnace and increase reliability of sample weight measurements.
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Danley Robert L.
Schaefer John W.
Baghdadi Aslan
Paul Hastings Janofsky & Walker LLP
Verbitsky Gail
Waters Investments Limited
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