US PATENT SUBCLASS 431 / 75
.~ By combustion or combustion zone sensor

Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
75.~ By combustion or combustion zone sensor {2}
76  DF  .~.~> Combustion product composition sensor
77  DF  .~.~> Of shutdown by response to sensed combustion failure or overheat {4}

DEFINITION

Classification: 431/75

(under subclass 18) Apparatus including a sensing means which responds to a condition within an area of combustion.

SEE OR SEARCH THIS CLASS, SUBCLASS:

19, for a burner control means responsive to combustion chamber pressure.

21, for a control responsive to a combustion destructible element.

24+, for a flame sensor with a checking or analyzing circuit.

27, for a control providing repeated start attempts prior to shutdown upon a sensed failure to establish combustion.

42+, for a second burner controlled by a sensor of a first burner. 63, for a combustion sensor providing for a shift from "start" to "run" feed.

68, for a control in which the sensing of a hot combustion zone condition blocks a restart attempt.

69+, for a control providing shutdown requiring reset on sensed absence of combustion in a proving period; and

74, for a system in which a flame sensor controls an igniter and fuel feeder in sequence.

SEE OR SEARCH CLASS

137, Fluid Handling,

65+, for a combustion failure responsive fuel safety cut off burner subcombination.

200, Electricity: Circuit Maker and Breakers,

136+, for a temperature controlled switch that may be a burner element.

236, Automatic Temperature and Humidity Regulation,

9+, for an automatic temperature central device responsive to temperature changes at a burner and in the apartment to be heated; subclass 11 for a hot air furnace in which the fire and the flow of heating air through the air chamber of the furnace are controlled; subclass 14 for a device regulating a fire under a boiler according to conditions in the combustion chamber and in the boiler; subclasses 15+ for the regulation of a fire according to conditions in the furnace; subclasses 21+ for a control for a boiler having a safety cut off for the heating means responsive to abnormal boiler conditions or to the failure of the heating means (e.g., fire, etc.); and subclasses 95 and 96 for automatic control of temperature by a flue or heater attached thermostat.