Measuring and testing – Volume or rate of flow – Thermal type
Reexamination Certificate
2008-01-14
2009-02-10
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
Thermal type
Reexamination Certificate
active
07487674
ABSTRACT:
A thermal flow sensor can adjust the temperature of a heating element in a highly precise and reliable manner with the use of simple circuits, devices and process steps. The sensor includes an amplifier section (7) that amplifies a voltage across opposite ends of at least one of resistors (3, 4, 5) that constitute a bridge circuit, a current control section (9) that is controlled based on an output voltage of the amplifier section (7), and an output terminal (14) that is connected to one end of a heating element (1) that is controlled to be energized by the current control section (9). The amplifier section (7) includes an amplification factor control section for controlling an amplification factor by an electric signal from a computer, and uses an output voltage which has been amplified and impressed to an input voltage to an operational amplifier (8).
REFERENCES:
patent: 6786088 (2004-09-01), Matsumura
patent: 7010971 (2006-03-01), Matsumoto et al.
patent: 7325449 (2008-02-01), Ohtsuka et al.
patent: 2006/0162442 (2006-07-01), Matsumoto et al.
patent: 2000-314645 (2000-11-01), None
patent: 2002-005717 (2002-01-01), None
patent: 2005-172463 (2005-06-01), None
Ariyoshi Yuji
Ohtsuka Kazuhiko
Mitsubishi Denki & Kabushiki Kaisha
Patel Harshad
Sughrue & Mion, PLLC
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