US PATENT SUBCLASS 60 / 39.57
.~.~.~ Combustion products pass through water

Current as of: June, 1999
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60 /   HD   POWER PLANTS

39.01  DF  COMBUSTION PRODUCTS USED AS MOTIVE FLUID {31}
39.53  DF  .~ With addition of steam and/or water {5}
39.56  DF  .~.~ Mixed in space above water {1}
39.57.~.~.~ Combustion products pass through water

DEFINITION

Classification: 60/39.57

(under subclass 39.56) Plants in which the products of combustion are discharged below the surface of the water in order that they may bubble through the water to the mixing zone.

SEE OR SEARCH CLASS

126, Stoves and Furnaces,

360, 367 and 368, for water heaters employing submerged heating means or stoves.