US PATENT SUBCLASS 502 / 412
.~.~ Diatomaceous earth

Current as of: June, 1999
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502 /   HD   CATALYST, SOLID SORBENT, OR SUPPORT THEREFOR: PRODUCT OR PROCESS OF MAKING

400  DF  SOLID SORBENT {6}
407  DF  .~ Silicon containing {6}
412.~.~ Diatomaceous earth

DEFINITION

Classification: 502/412

Diatomaceous earth:

(under subclass 407) Composition wherein the silicon containing material is a diatomaceous earth.