Measuring and testing – Volume or rate of flow – Thermal type
Reexamination Certificate
2007-10-23
2007-10-23
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
Thermal type
C073S204260
Reexamination Certificate
active
10484575
ABSTRACT:
A thermal air flow rate measuring apparatus of great precision wherein sensitivity is enhanced by sensors having different output characteristics and an operating device employing a digitized signal. The sensitivity and temperature can be corrected easily depending on the flow direction of fluid. The measuring apparatus includes at least one heating resistor disposed in a gas fluid, temperature detecting resistors formed at an upstream part and a downstream part of the heating resistor in the flow direction of the fluid, a device for outputting at least two signals relating to the flow rate of the fluid, a quantizing device for quantizing the output values, and an operating device for operating the flow rate based on the quantized signals.
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Supplementary European Search Report dated Aug. 3, 2006 (Three (3) pages).
Igarashi Shinya
Kanke Atsushi
Ohta Kenji
Yamada Masamichi
Yoneda Hiroshi
Crowell & Moring LLP
Hitachi Car Engineering Co. Ltd.
Patel Harshad
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