US PATENT SUBCLASS 159 / 28.1
.~.~ Heating elements

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

22  DF  CLOSED EVAPORATING CHAMBERS {4}
23  DF  .~ Indirectly heated {4}
28.1.~.~ Heating elements {5}
28.2  DF  .~.~.~> Baffled
28.3  DF  .~.~.~> Spur tubes
28.4  DF  .~.~.~> Coils
28.5  DF  .~.~.~> Tubular inserts
28.6  DF  .~.~.~> Plate-type evaporator

DEFINITION

Classification: 159/28.1

Heating elements:

(under subclass 23) Devices relating to the means for maintaining the heating medium separate from, but in heating contact with, the liquid or the surface of the liquid container.

SEE OR SEARCH CLASS

122, Liquid Heaters and Vaporizers,

44.1+, for fire tube boilers.

165, Heat Exchange, appropriate subclasses, for the attemperator, per se.