Measuring and testing – Volume or rate of flow – Thermal type
Reexamination Certificate
2011-06-07
2011-06-07
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
Thermal type
C073S204260
Reexamination Certificate
active
07954373
ABSTRACT:
There is provided a thermal type flow meter capable of accurately detecting a flow rate even when a fluid temperature varies rapidly or when the fluid temperature is high. A probe includes: a first main heating resistor; a second main heating resistor set at a temperature different from that of the first main heating resistor; and a sub-heating resistor for heating lead wires of the two main heating resistors. A CPU of a sensor control circuit finds a fluid temperature by using the two main heating resistors, and finds a fluid flow rate by using at least one of the two main heating resistors.
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European Search Report dated Aug. 14, 2009 (Three (3) pages).
Hoshika Hiroaki
Sukegawa Yoshihiro
Tokuyasu Noboru
Yamaoka Shiro
Crowell & Moring LLP
Hitachi , Ltd.
Patel Harshad
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