Flow sensor and method of manufacturing the same

Measuring and testing – Volume or rate of flow – Thermal type

Reexamination Certificate

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Reexamination Certificate

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06981410

ABSTRACT:
A flow sensor includes a substrate, an electrical insulating film, and a flow velocity detection mechanism. In the substrate, a diaphragm portion having a first surface in contact with a measurement target fluid and a thick fixing portion surrounding the diaphragm portion are integrally formed. The electrical insulating film is formed on a second surface of the diaphragm portion which is on a side opposite to the first surface. The flow velocity detection mechanism is arranged on the electrical insulating film. A method of manufacturing a flow sensor is also disclosed.

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Japanese Office Action issued Feb. 15, 2005.
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State Intellectural Property Office of People's Republic of China, First Office Action to Yamatake Corporation, Application No. 03125149.8 “Flow Sensor and Method of Manufacturing the Same”, dated Jan. 21, 2005.
Hirata K et al: “Stainless steel-based integrated mass-flow controller for reactive and corrosive gases”, Sensors and Actuators A, Elsevier Sequoia S.A., Lausane, CH, vol. 97-98 Apr. 2000 pp. 33-38.

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