US PATENT SUBCLASS 210 / 500.25
.~.~.~ Metal containing

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}
500.25.~.~.~ Metal containing

DEFINITION

Classification: 210/500.25

Metal containing:

(under subclass 500.21) Subject matter wherein the membrane comprises a metal present ineither elemental form or in a compound of that metal.