US PATENT SUBCLASS 122 / 425
.~.~.~ Furnace gases and steam

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

412  DF  FEED HEATERS {17}
*  DD  .~ Horizontal fire tube boiler {2}
423  DF  .~.~ Smoke box {3}
425.~.~.~ Furnace gases and steam

DEFINITION

Classification: 122/425

(under subclass 423) Feed water heaters heated both by furnace gases and by steam, which may or may not come into contact with the feed water.

SEE OR SEARCH THIS CLASS, SUBCLASS:

422, 432 and 440, for other types of feed heaters heated by furnace gases and steam in combination.