Fluid flow measuring instrument

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system

Reexamination Certificate

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Reexamination Certificate

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07634366

ABSTRACT:
A measurement control section includes a time measuring section for controlling an operation of measuring a travel time of an ultrasonic wave. The measurement control section operations, based on a high rate clock signal supplied from a ceramic oscillation circuit during the time measuring operation. A clock control section stops the high rate clock signal supplied from the ceramic oscillation circuit every time when the time measuring section completes its time measuring operation, and uses a low rate clock signal supplied from a quartz oscillation circuit to count a standby time between the end of measuring the travel time and the start of carrying out the next measuring operation.

REFERENCES:
patent: 4337667 (1982-07-01), Takada
patent: 6796189 (2004-09-01), Umekage et al.
patent: 6941821 (2005-09-01), Umekage et al.
patent: 2005/0000301 (2005-01-01), Umekage et al.
patent: 2008/0148866 (2008-06-01), Frohlich et al.
patent: 09-133562 (1997-05-01), None
patent: 9-133562 (1997-05-01), None
patent: 09-304139 (1997-11-01), None
patent: 9-304139 (1997-11-01), None
patent: 2001-289681 (2001-10-01), None
patent: 2002-310752 (2002-10-01), None
patent: 2002-350202 (2002-12-01), None
patent: 2003-028685 (2003-01-01), None
patent: 2003-315124 (2003-11-01), None
International Search Report issued Sep. 12, 2006.

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