Wells – Processes – Heating – cooling or insulating
Reexamination Certificate
2008-05-13
2008-05-13
Kreck, John (Department: 3672)
Wells
Processes
Heating, cooling or insulating
C166S060000
Reexamination Certificate
active
07370704
ABSTRACT:
Certain embodiments provide a heater. The heater includes an inner electrical conductor. A heater section at least partially surrounds the inner electrical conductor. The heater section is configured to generate an electrically resistive heat output during application of time-varying electrical current to the heater section. The heater section includes ferromagnetic material. An outer electrical conductor at least partially surrounds the heater section. An applied time-varying electrical current is configured to propagate through the inner electrical conductor and the outer electrical conductor in substantially the same direction. The applied time-varying electrical current is configured to propagate through the heater section in a substantially opposite direction. The heater provides a first heat output when time-varying electrical current is applied to the heater below a selected temperature, and a second heat output approximately at and above the selected temperature during use. The second heat output is reduced compared to the first heat output.
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paten
Kreck John
Shell Oil Company
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