Measuring and testing – Fluid pressure gauge – Diaphragm
Reexamination Certificate
2007-02-07
2008-10-21
Allen, Andre J (Department: 2855)
Measuring and testing
Fluid pressure gauge
Diaphragm
C073S736000
Reexamination Certificate
active
07437940
ABSTRACT:
An apparatus for measuring differential pressure includes first and second sensor units. The first sensor unit detects directly a first pressure of a substance at a first position and acquires a first detection result that indicates the first pressure. The second sensor unit detects directly a second pressure of the substance at a second position different from the first position. The second sensor unit acquires a second detection result that indicates the second pressure and receives the first detection result from the first sensor unit. The second sensor unit calculates a differential pressure between the first and second positions with reference to the first and second detection results.
REFERENCES:
patent: 5870695 (1999-02-01), Brown et al.
“The Bible of Field Instrument”, Apr. 17, 2001, pp. 62, 63 and unnumbered, Publisher: Kogyo Gigyutu-Sha.
Koyama Etsutarou
Takahashi Yuuichirou
Allen Andre J
Sughrue & Mion, PLLC
Yokogawa Electric Corporation
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