US PATENT SUBCLASS 210 / 613
.~.~.~ Digesting sludge

Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

600  DF  PROCESSES {14}
601  DF  .~ Treatment by living organism {13}
612  DF  .~.~ And regulating temperature during biological step {1}
613.~.~.~ Digesting sludge

DEFINITION

Classification: 210/613

Digesting sludge:

(under subclass 612) Process in which fermentation of sludge is effected.