US PATENT SUBCLASS 210 / 500.28
.~.~.~.~ Cyclic

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.~.~.~.~ Cyclic {2}
500.29  DF  .~.~.~.~.~> Cellulosic {1}
500.33  DF  .~.~.~.~.~> Homocyclic {1}

DEFINITION

Classification: 210/500.28

Cyclic:

(under subclass 500.27) Subject matter comprising an organic substance which includes a ring structute, i.e., a series of atoms bonded one to another in such a fashion that the chain closes upon itself.