Measuring and testing – Gas analysis – Density or specific gravity
Reexamination Certificate
2006-03-30
2010-06-08
Rogers, David A. (Department: 2856)
Measuring and testing
Gas analysis
Density or specific gravity
C073S024050, C073S030010, C073S031050, C073S054010
Reexamination Certificate
active
07730766
ABSTRACT:
A gas viscosity sensor comprises a signal processing circuit and a sensor element, including a gas pressure generating system and a differential pressure measuring system in fluid communication therewith, the differential pressure measuring system comprising a measuring chamber (14) bounded by a thin membrane (28), an inlet-outlet channel or orifice interconnecting the measuring chamber to a source of gas for which the viscosity is to be determined, the inlet-outlet channel or orifice having dimensions adapted to provide resistance to the outflow and inflow of gas in the measuring chamber, and a membrane displacement sensor (32) adapted to measure a time dependent displacement of the membrane due to pressure variations in the measuring cavity.
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Ryser Peter
Straessler Sigfrid
Baker & Daniels LLP
Ecole Polytechnique Federale de Lausanne
Rogers David A.
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