US PATENT SUBCLASS 122 / 428
.~ Internal conduit

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

412  DF  FEED HEATERS {17}
428.~ Internal conduit {5}
429  DF  .~.~> Automatic sediment valve
430  DF  .~.~> Blow-off delivery
431  DF  .~.~> Filter in boiler
432  DF  .~.~> Furnace gases
433  DF  .~.~> Trap outside boiler

DEFINITION

Classification: 122/428

(under subclass 412) Subject matter comprising a conduit located inside a boiler for heating the water before it is finally delivered to the boiler from the conduit. The feed water may or may not be mixed with boiler water or steam before its final delivery to the boiler.

SEE OR SEARCH THIS CLASS, SUBCLASS:

36, and 444, for device where feed water is injected into the boiler water tubes for heating the water and increasing circulation.