Measuring and testing – Volume or rate of flow – Thermal type
Reexamination Certificate
2008-03-25
2008-03-25
Thompson, Jewel (Department: 2855)
Measuring and testing
Volume or rate of flow
Thermal type
Reexamination Certificate
active
11536167
ABSTRACT:
An apparatus and method for fluid flow measurement are provided. The apparatus includes a first thermistor; a second thermistor; a first deflecting member configured to shield the first thermistor from fluid flowing in a first direction; a second deflecting member configured to shield the second thermistor from fluid flowing in a second direction where the second direction is substantially opposite the first direction; and a circuit in electrical communication with the first thermistor and the second thermistor. The circuit includes a comparator for comparing a first signal from the first thermistor to a second signal from the second thermistor. The comparator provides an output indicative of a direction of fluid flowing past the first thermistor and the second thermistor.
REFERENCES:
patent: 4206638 (1980-06-01), Djorup
patent: 5263380 (1993-11-01), Sultan et al.
patent: 6928884 (2005-08-01), Pearson
patent: 7036367 (2006-05-01), Golan
Delphi Technologies Inc.
McBain Scott A.
Thompson Jewel
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