US PATENT SUBCLASS 236 / 15 BR
.~ Commercial furnace controls

Current as of: June, 1999
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236 /   HD   AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION

15 R  DF  FURNACE CONTROLLED {4}
15 BR.~ Commercial furnace controls {7}
15 BA  DF  .~.~> Solid fuel burning
15 BB  DF  .~.~> Product and furnace temperature sensor
15 BC  DF  .~.~> With conveyor thru furnace
15 BD  DF  .~.~> Air and fuel control
15 BE  DF  .~.~> Recuperator, gas turbine, melting furnace
15 BF  DF  .~.~> Specialized furnace or heater, e.g., crystal growing
15 BG  DF  .~.~> Timer or program

Unofficial Alpha Subclasses: R A BR BA BB BC BD BE BF BG

DEFINITION

Classification: 236/15

(under the class definition) Devices controlling the fire according to conditions in the furnace.

SEE OR SEARCH THIS CLASS, SUBCLASS:

14, for controls responsive to boiler and furnace.

95, 96, for furnace control where the thermostat is attached to the outside of the heater or flue.

104, for furnace controls operated by the expansion or contractions of the furnace parts due to temperature changes.