US PATENT SUBCLASS 159 / 46
PRELIMINARY HEATERS AND HEAT ECONOMIZERS


Current as of: June, 1999
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159 /   HD   CONCENTRATING EVAPORATORS

46PRELIMINARY HEATERS AND HEAT ECONOMIZERS


DEFINITION

Classification: 159/46

(under the class definition) Apparatus combined with or specifically designed for use in combination with means to effect a saving of heat.

SEE OR SEARCH THIS CLASS, SUBCLASS:

17.1+, for concentrating apparatus with multiple effects.

SEE OR SEARCH CLASS

122, Liquid Heaters and Vaporizers,

412+, for feed heaters for boilers generally.