Measuring and testing – Fluid pressure gauge – Diaphragm
Reexamination Certificate
2006-11-14
2006-11-14
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Fluid pressure gauge
Diaphragm
C073S736000, C385S013000
Reexamination Certificate
active
07134346
ABSTRACT:
A differential pressure transducer which incorporates a Fabry-Perot sensor for direct quantitative measurements of the distance displaced by a piston abutting two pressure boundaries is described. The apparatus includes a piston with an annular protrusion which is fitted into a transducer housing having a peripheral groove that serves as a stop to prevent damage to the in overpressure situations. A method of measuring differential pressure using a Fabry-Perot sensor is also contemplated.
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Berthold John W.
Lopushansky Richard L.
Allen Andre
Davidson Instruments Inc.
Earp III Robert H.
McDonald Hopkins Co. LPA
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