US PATENT SUBCLASS 431 / 18
TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL

Current as of: June, 1999
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431 /   HD   COMBUSTION

18TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
19  DF  .~> Responsive to combustion chamber pressure
20  DF  .~> Of or by exhaust damper or exhaust pump
21  DF  .~> By combustion destructible element, e.g., fusible plug, etc.
22  DF  .~> By sensing of gas leakage, flashback or escaped flame
23  DF  .~> Of means protecting burner component from combustion heat
24  DF  .~> With test circuit checking or analyzing flame sensing circuit for malfunction {2}
27  DF  .~> Providing repeated start attempts prior to shutdown upon failure to establish combustion
28  DF  .~> Actuation sequence of electric feed heater and feed flow controller or igniter
29  DF  .~> Control of purger, of scavenger or of combustion start-up delay period {1}
32  DF  .~> Of cleaning means
33  DF  .~> Of extinguishing means {2}
36  DF  .~> Of or by burner feed supply heating structure {2}
42  DF  .~> Sensor of first burner controls second burner, e.g., pilot and main, etc. {8}
60  DF  .~> Of sequential operation of plural burners, e.g., pilot and main, etc. {1}
62  DF  .~> Of diverse feed or feed rate in starting, e.g., enriching fuel mixture in starting, etc. {1}
64  DF  .~> Level responsive means controls fuel level in wick pot or pot type burner
65  DF  .~> Fuel feed cut off by collected fuel over-flow
66  DF  .~> Sensor of electrical condition or temperature of electrical igniter controls fuel feed
67  DF  .~> Igniter heat up and fuel feed sequence controlled by timer or retarder
68  DF  .~> Sensing of hot combustion zone condition blocks restart attempt
69  DF  .~> Shutdown by sensed absence of flame in proving period {2}
72  DF  .~> Of igniter and feed controlled sequence {2}
75  DF  .~> By combustion or combustion zone sensor {2}
86  DF  .~> By manually started timer or retarder, or by time of day device {1}
88  DF  .~> By tilting, jarring, or mechanical damage
89  DF  .~> By condition of burner feed or feed means {1}

DEFINITION

Classification: 431/18

(under the class definition) Apparatus whereby (1) a control is exerted by means sensing an environmental or operating condition; (2) the time at which an actuation is performed is controlled; (3) the length of time taken to perform an operation is controlled; (4) there is means providing a sequence of events set to occur at predetermined intervals; or (5) there is a means terminating a single operation in a fixed position to restart an additional cycle, which cycle is more complex than a mere starting or stopping of a single device.

SEE OR SEARCH CLASS

236, Automatic Temperature and Humidity Regulation, appropriate subclass for a residual system including a temperature modifier (e.g., burner, etc.) and a means sensing the temperature of a chamber or material acted upon by the modifier; the sensing means regulating the temperature of the chamber or material by controlling the operation of the modifier.

364, Electrical Computers and Data Processing Systems,

130+, for data processing control systems wherein the control system is claimed generically, and subclasses 528.01+, for chemical process control or monitoring systems, particularly subclass 528.09 for control of combustion or heating apparatus.