US PATENT SUBCLASS 210 / 655
.~.~.~.~.~.~ Cellulosic


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

600  DF  PROCESSES {14}
634  DF  .~ Liquid/liquid solvent or colloidal extraction or diffusing or passing through septum selective as to material of a component of liquid; such diffusing or passing being effected by other than only an ion exchange or sorption process {11}
649  DF  .~.~ Diffusing or passing through septum selective as to material of a component of liquid {1}
650  DF  .~.~.~ Filtering through membrane (e.g., ultrafiltration) {2}
652  DF  .~.~.~.~ Hyperfiltration (e.g., reverse osmosis, etc.) {1}
653  DF  .~.~.~.~.~ Utilizing specified membrane material {2}
655.~.~.~.~.~.~ Cellulosic


DEFINITION

Classification: 210/655

Cellulosic:

(under subclass 653) Process in which the membrane is constituted of a naturally occurring polymeric carbohydrate, usually derived from wood, cotton, or flax.