US PATENT SUBCLASS 236 / 15 BD
.~.~ Air and fuel control

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

15 R  DF  FURNACE CONTROLLED {4}
15 BR  DF  .~ Commercial furnace controls {7}
15 BD.~.~ Air and fuel control

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.