Chemistry: electrical and wave energy – Apparatus – Electrolytic
Reexamination Certificate
2007-05-11
2010-02-02
Bell, Bruce F (Department: 1795)
Chemistry: electrical and wave energy
Apparatus
Electrolytic
C204S424000, C204S425000, C204S426000, C204S427000, C073S023320, C123S694000, C123S695000, C123S696000, C123S697000
Reexamination Certificate
active
07655121
ABSTRACT:
An interface device for a gas sensor includes a detection resistor having first and second ends to generate voltages by a current output of the gas sensor, a differential amplifier having first and second input terminals to receive the voltages of the first and second resistor ends and an output terminal to output a voltage according to a difference between the voltages of the first and second resistor ends, a first switching element to transmit the voltage of the first resistor end to the first input terminal of the differential amplifier in a transmission state and interrupt transmission of the voltage of the first resistor end to the first input terminal of the differential amplifier in an interruption state and a second switching element turned on to establish continuity between the first and second input terminals of the differential amplifier when the first switching element is in the interruption state.
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Ieda Norikazu
Inagaki Hiroshi
Uemura Tomonori
Bell Bruce F
NGK Spark Plug Co. Ltd.
Sughrue & Mion, PLLC
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