US PATENT SUBCLASS 210 / 500.42
.~.~.~.~ Vinyl

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}
500.42.~.~.~.~ Vinyl {1}
500.43  DF  .~.~.~.~.~> Acrylonitrile

DEFINITION

Classification: 210/500.42

Vinyl:

(under subclass 500.27) Subject matter comprising a CH2=CH2 group.

(1) Note. When polyvinyl synthetic resins are present, various of the hydrogens may be replaced by other atoms.