Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2007-03-13
2007-03-13
Paschall, Mark (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S216000, C219S205000, C399S069000
Reexamination Certificate
active
11236144
ABSTRACT:
A circuit includes a switching device for controlling a power signal to be applied to a heating device. A control circuit is configured for comparing a temperature signal, indicative of the temperature of the heating device, to a temperature setpoint to generate a gate pulse signal that controls the duration of the power signal to be applied to the heating device. The control circuit is further configured for comparing the duration of the power signal to be applied to the heating device to a minimum pulse duration and, if the duration of the power signal to be applied to the heating device is at least equal to the minimum pulse duration, providing the gate pulse signal to the switching device.
REFERENCES:
patent: 3851144 (1974-11-01), Hutner
patent: 5422461 (1995-06-01), Weiss et al.
patent: 5460221 (1995-10-01), Stalsberg et al.
patent: 5789723 (1998-08-01), Hirst
patent: 6111230 (2000-08-01), Cao et al.
Bush Craig Palmer
Harris Steven Jeffrey
Hines Jeffrey Thomas
Sears Johnny Ray
Grossman Tucker Perreault & Pfleger PLLC
Lexmark International Inc.
Paschall Mark
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