Electric resistance heating devices – Heating devices – Tank or container type liquid heater
Reexamination Certificate
2008-01-29
2011-11-29
Campbell, Thor (Department: 3742)
Electric resistance heating devices
Heating devices
Tank or container type liquid heater
C392S447000, C392S457000, C392S451000
Reexamination Certificate
active
08068727
ABSTRACT:
Methods and systems for evaluating the condition of a water tank having a powered anode protection system. The water heater includes a storage tank to hold water, a powered anode, and a control circuit. The control circuit includes a variable voltage supply, a voltage sensor, and a current sensor. The control circuit is configured to compare a measured parameter to a threshold. In some constructions, the threshold is indicative of a condition of the storage tank at which the powered anode is no longer able to protect the storage tank from corrosion. In other constructions, the threshold is predicative of a potential failure of the storage tank caused by corrosion. In some constructions, the control circuit is configured to estimate a time remaining until the predicted failure of the storage tank.
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Caves Andrew Robert
Knoeppel Ray Oliver
Phillips Andrew William
Schulz John Matthew
Van Sistine Thomas Gerard
AOS Holding Company
Campbell Thor
Michael & Best & Friedrich LLP
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