Data processing: measuring – calibrating – or testing – Measurement system
Reexamination Certificate
2007-12-11
2007-12-11
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
C702S137000
Reexamination Certificate
active
11121144
ABSTRACT:
A density observer for estimating an actual density of a material with a proportional integral controller responsive to a density error determined by subtracting a feedback estimated density from a sensed density. A method of estimating a density of a material by determining a sensed density of the material, determining an estimated density of the material, determining a density error by subtracting the estimated density of the material from the sensed density of the material, and iteratively redetermining the estimated density based on the density error.
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Borgstadt Justin A.
Dykstra Jason D.
Barlow John
Conley & Rose, P.C.
Halliburton Energy Service,s Inc.
Washburn Douglas N
Wustenberg John W.
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