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
07398681
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
LandOfFree
Gas sensor based on dynamic thermal conductivity and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gas sensor based on dynamic thermal conductivity and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas sensor based on dynamic thermal conductivity and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2766911