Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2007-07-10
2007-07-10
Nguyen, Hung (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S501000, C340S577000, C340S581000, C340S584000, C340S588000, C122S014200, C122S014310
Reexamination Certificate
active
11117138
ABSTRACT:
In a flammable vapor sensor-based shut-off system of a fuel-fired water heater the sensor resistance output signal degradation caused by aging of the sensor is automatically compensated for using an operational timer having an output signal indicative of the total life of the sensor subsequent to its installation on the water heater. In one embodiment of the system, a resistance adjustment signal having a magnitude related in a predetermined manner to the timer output signal is created and added to the sensor resistance output signal. In another embodiment, the timer output signal is used to appropriately adjust the minimum-maximum received sensor signal magnitude range, based on the installed age of the sensor, which will preclude combustion in the appliance. Additionally, in each embodiment thereof the system is provided with an improved initial minimum-maximum sensor signal magnitude range. Other types of shut-off gas sensors may be alternatively utilized.
REFERENCES:
patent: 3984976 (1976-10-01), Nagai
patent: 4030462 (1977-06-01), Sasayama et al.
patent: 4131413 (1978-12-01), Ryno
patent: 4364227 (1982-12-01), Yoshida et al.
patent: 4502444 (1985-03-01), Rubbo et al.
patent: 4565519 (1986-01-01), Carignan
patent: 5120214 (1992-06-01), West et al.
patent: 5255512 (1993-10-01), Hamburg et al.
patent: 5359852 (1994-11-01), Curran et al.
patent: 5526280 (1996-06-01), Consadori et al.
patent: 5838243 (1998-11-01), Gallo
patent: 6025788 (2000-02-01), Diduck
patent: 6282888 (2001-09-01), Sealy et al.
patent: 6356199 (2002-03-01), Niziolek et al.
patent: 6390028 (2002-05-01), Langmead et al.
patent: 6412447 (2002-07-01), Trant et al.
patent: 6626133 (2003-09-01), Schell et al.
patent: 6662757 (2003-12-01), Lesage
patent: 2004/0200722 (2004-10-01), Starling et al.
patent: 2004/0204920 (2004-10-01), Zimmermann et al.
Castleberry Walter T.
Harrigill William T.
Hotton Bruce A.
Haynes and Boone LLP
Nguyen Hung
Rheem Manufacturing Company
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