US PATENT SUBCLASS 122 / 91
.~.~.~.~ Trapped circuit

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

44.1  DF  FIRE TUBE {11}
51  DF  .~ Horizontal {22}
90  DF  .~.~ Water firebox {8}
*  DD  .~.~.~ Firebox water heater {1}
91.~.~.~.~ Trapped circuit

DEFINITION

Classification: 122/91

(under subclass 90) Devices with some form of water heating chamber or conduits within the firebox, connected in circuit with the main part of the boiler, with some form of sediment trap in the water circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

59, for circulating conduits with water heaters in the firebox.

202, for horizontal cylindrical boilers having water heating tubes or chambers in circuit with the boiler, with a sediment trap in the circuit.

380, and 403, for analogous art with a trapped circuit.