Measuring and testing – Volume or rate of flow – Proportional
Reexamination Certificate
2011-06-21
2011-06-21
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
Proportional
C073S204260
Reexamination Certificate
active
07963161
ABSTRACT:
An object of the present invention is to provide a structure which prevents a particulate contaminant and a liquid contaminant on which centrifugal separation hardly works, from arriving at a sensor element part. In order to attain the above described object, in a heat resistor type air flow rate measuring device which includes an auxiliary passage taking in a part of a fluid flowing in a main passage, and a plate-shaped sensor element installed in the aforesaid auxiliary passage and for detecting a flow rate of the fluid, and is a heat resistor type flow rate measuring device having an auxiliary passage formed along a curved line at 90° or more in an auxiliary passage portion at an upstream side from the plate-shaped sensor element, the aforesaid auxiliary passage is formed along a curved line at 90° or more on a phantom plane orthogonal to a sensor formation surface of the plate-shaped sensor element and parallel with a flow, and a sensor formation surface side and a rear side of the plate-shaped sensor element have gaps from an auxiliary passage wall surface.
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European Search Report dated Mar. 17, 2009 (Four (4) pages).
Hirayama Hiroshi
Miki Takahiro
Morino Takeshi
Okamoto Yuki
Saito Naoki
Crowell & Moring LLP
Hitachi , Ltd.
Patel Harshad
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