US PATENT SUBCLASS 210 / 792
.~.~.~ Particulate bed

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

600  DF  PROCESSES {14}
767  DF  .~ Separating {16}
791  DF  .~.~ Rehabilitating or regenerating filter medium {2}
792.~.~.~ Particulate bed {2}
793  DF  .~.~.~.~> Reverse flow {1}
796  DF  .~.~.~.~> Includng mechanical agitation

DEFINITION

Classification: 210/792

Particulate bed:

(under subclass 791) Process in which the filter medium is of the loose particulate material type, e.g., sand bed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

269+, for a particulate material type separator having rehabilitation means.

670, for ion exchange or sorption processes with rehabilitation.

710+, for precipitation processes including reagent recovery.

SEE OR SEARCH CLASS

55, Gas Separation, subclasses beginning with

474, for gas filter apparatus including loose material, especially subclasses 512+. 95, Gas Separation: Processes,

274+, for processes of gas separation using particulate solids.

134, Cleaning and Liquid Contact With Solids, appropriate subclasses for processes there provided for including rehabilitation of the agent used.