US PATENT SUBCLASS 122 / 448.1
AUTOMATIC CONTROL OF FLUID FUEL AND WATER

Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

448.1AUTOMATIC CONTROL OF FLUID FUEL AND WATER {3}
448.2  DF  .~> Having fuel or feed bypass
448.3  DF  .~> Multiple boiler regulation
448.4  DF  .~> Once through

DEFINITION

Classification: 122/448.1

AUTOMATIC CONTROL OF FLUID FUEL AND WATER:

(under the class definition) Devices for controlling automatically both the feed of fluid fuel to the burner and the feed of water to the boiler.

SEE OR SEARCH CLASS

126, Stoves and Furnaces,

351, for water heaters in general provided with automatic control of fuel, also fuel and water when the draw off faucet is operated.

236, Automatic Temperature and Humidity Regulation, appropriate subclass, for the control, per se, for the fuel feed.

417, Pumps,

279+, for pumps having condition responsive control of the pumped fluid.