Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2011-03-29
2011-03-29
He, Amy (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
Reexamination Certificate
active
07915901
ABSTRACT:
A thin and narrow electrical resistance corrosion sensor defines measurement, reference and check resistors as abutting serially disposed portions of a thin strip-like metal resistance element, such as a carbon steel or ductile iron element, having metallurgical properties which match those of a corrodible structure of interest such as a pipeline buried in the ground. The resistance element is bonded to a thin, long and narrow nonconductive structural substrate to which is also bonded a flat wire harness which includes conductors connected to the ends of the resistance element and to selected locations of the element between its ends. The resistance element, the substrate, and the wire harness and its connections to the resistance element are encapsulated by a nonconductive protective coating except over the area of the measurement resistor so that such resistor can be exposed to the adjacent environment. The sensor can be used with conventional corrosion measurement instruments. Arrangements for use of plural sensors to measure corrosion due to direct current in a structure of interest, and to measure corrosion due to alternating currents in that structure, also are described.
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Rohrback Cosasco Systems, Inc., Model 600, “Corrosometer® Probe Atmospheric”, Bulletin # 212-F (2 pgs). Date: Sep. 2004.
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Bell Graham E. C.
Moore Clifford G.
Christie Parker & Hale LLP
He Amy
M. J. Schiff & Associates, Inc.
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