Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Masamichi Yamada1
Keiichi Nakada1
Keiji Hanzawa1
Masahiro Matsumoto1
Izumi Watanabe1
Date of Patent
November 21, 2006
1Patent Application Number
108603261
Date Filed
June 4, 2004
1Patent Primary Examiner
Patent abstract
A thermal air flowmeter which improves air flow rate measurement sensitivity, reduces power consumption of a heating element and broadens the measuring range. A heating resistor is provided on insulating film in a thermal insulating area as a rectangular space on a flat substrate; and two resistance temperature detectors are provided upstream and downstream of the heating resistor. The sides of the rectangular thermal insulating area which are parallel to the axis of air flow are longer than its sides which are perpendicular to the axis of air flow.
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