US PATENT SUBCLASS 159 / 28.3
.~.~.~ Spur tubes

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  DF  .~.~ Heating elements {5}
28.3.~.~.~ Spur tubes

DEFINITION

Classification: 159/28.3

Spur tubes:

(under subclass 28.1) Apparatus wherein the heat exchange tubes are closed at one end.