Measuring and testing – Volume or rate of flow – Thermal type
Reexamination Certificate
2008-07-15
2008-07-15
Cygan, Michael (Department: 2855)
Measuring and testing
Volume or rate of flow
Thermal type
Reexamination Certificate
active
11234511
ABSTRACT:
An apparatus and method for gas detection. The apparatus comprises a) a sample chamber for holding a gas sample, b) a sealable vacuum port in fluid communication with the sample chamber, for evacuating the sample chamber, c) a sealable inlet port in fluid communication with the sample chamber, for introducing the gas sample into the evacuated sample chamber, and d) a thermal conductivity sensing element at least partly disposed within the sample chamber, for measuring the thermal conductivity of the gas sample. A gas sample released into the evacuated sample chamber requires a time interval to contact the thermal conductivity sensing element. The time interval is a measure of gas speed. Thermal conductivity and temperature of the gas sample are measured following determination of gas speed. By determining three parameters in a single sample of gas, different gas mixtures having similar thermal conductivities can be distinguished.
REFERENCES:
patent: 2042646 (1936-06-01), Willenborg
patent: 3167956 (1965-02-01), Grey
patent: 3186229 (1965-06-01), Liben
patent: 3616677 (1971-11-01), Oppegaard
patent: 4404846 (1983-09-01), Yamauchi et al.
patent: 4736302 (1988-04-01), Kinugawa et al.
patent: 5356819 (1994-10-01), Ritschel
patent: 5463899 (1995-11-01), Zemel et al.
patent: 5644068 (1997-07-01), Okamoto et al.
patent: 6169965 (2001-01-01), Kubisiak et al.
patent: 6290388 (2001-09-01), Saul et al.
Pascal Tardy, Jean-Rene' Coulon, Claude Lucat, Francis Menil, “Dynamic Thermal Conductivity Sensor for Gas Detection”, Elsevier B.V., Science Direct Sep. 4, 2003, 63-65.
Aifan Chen, Ruixian Luo, Thiam-Chye Tan, and Chung-Chiun Liu. “A Thick-Film Calorimetric Sensor for Monitoring the Concentration of Combustible Gases” Sensors and Actuators, 19 (1989) 237-248.
Hackett, legal representative Nora
Mc Clanahan Michael
Norbeck Joseph N.
Park Chan Seung
Berliner & Associates
Cygan Michael
The Regents of the University of California
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