US PATENT SUBCLASS 210 / 500.31
.~.~.~.~.~.~.~ Cellulose diacetate

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

348  DF  FILTER {25}
500.1  DF  .~ Material {6}
500.21  DF  .~.~ Semipermeable membrane {6}
500.27  DF  .~.~.~ Organic {7}
500.28  DF  .~.~.~.~ Cyclic {2}
500.29  DF  .~.~.~.~.~ Cellulosic {1}
500.3  DD  .~.~.~.~.~.~ Cellulose acetate {2}
500.31.~.~.~.~.~.~.~ Cellulose diacetate

DEFINITION

Classification: 210/500.31

Cellulose diacetate:

(under subclass 500.30) Subject matter comprising a cellulose acetate in which the cellulose ester includes two and only two-O-C(=O)-CH3 groups.