US PATENT SUBCLASS 159 / 20.1
.~ Variable or counterflow

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

17.1  DF  MULTIPLE EFFECTS {6}
20.1.~ Variable or counterflow {1}
20.2  DF  .~.~> With effect switching means

DEFINITION

Classification: 159/20.1

Variable or counterflow:

(under subclass 17.1) Apparatus in which the direction of flow from vessel to vessel of the liquid undergoing evaporation is not parallel to the flow of the evolved vapors or is variable with respect thereto, or the order of the pans in the series with respect to the flow of either vapor of liquid is variable.