US PATENT SUBCLASS 159 / 46
PRELIMINARY HEATERS AND HEAT ECONOMIZERS
Current as of:
June, 1999
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159 /
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CONCENTRATING EVAPORATORS
46
PRELIMINARY 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.