US PATENT SUBCLASS 196 / 117
.~.~ Internal flues


Current as of: June, 1999
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196 /   HD   MINERAL OILS: APPARATUS

104  DF  VAPORIZING {22}
116  DF  .~ Furnaces and flues {1}
117.~.~ Internal flues


DEFINITION

Classification: 196/117

(under subclass 116) The combination of furnace with mineral-oil vaporizer having flues for combustion gases passing through the vaporizer.

SEE OR SEARCH CLASS

122, Liquid Heaters and Vaporizers,

44.1, and 135.1.

159, Concentrating Evaporators,

28.1+, and 40.