Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2006-08-01
2006-08-01
Paschall, Mark (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S497000, C219S492000, C219S202000, C219S205000, C073S204250, C073S204180
Reexamination Certificate
active
07084378
ABSTRACT:
A heating element protection apparatus for a mass-flow sensor may include a heating element disposed in a gas, a gas temperature sensor disposed in the gas to sense a temperature of the gas, a slope detector to measure a slope of the temperature as power is supplied to the heating element, and a heating element controller to supply power to the heating element to replace heat dissipated by the gas. The heating element controller may detect a temperature of the heating element and may supply power to the heating element based on the heating element temperature and the gas temperature, and the power may be switched off for a predetermined period of time if a magnitude of the slope is greater than a reference magnitude.
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Burkholder Nelson R.
Ganseman Chris
Geyer Stephen M.
Griffin Joseph R.
Van De Voorde Patrick
Epiq, Sensor-Nite USA, Inc.
Mack Trucks, Inc.
Paschall Mark
Rothwell, Figg Ernst & Manbeck, PC
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