US PATENT SUBCLASS 159 / 18
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Current as of: June, 1999
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159 /   HD   CONCENTRATING EVAPORATORS

17.1  DF  MULTIPLE EFFECTS {6}
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DEFINITION

Classification: 159/18

(under subclass 17.1) Apparatus in which the vessels are placed one above the other, so that the vapors evolved in the lower vessel will rise by gravity into contact with the bottom of the heating element of the next vessel above.

SEE OR SEARCH THIS CLASS, SUBCLASS:

13.1+, for superimposed films.

21, for combined open and closed pans.