US PATENT SUBCLASS 530 / 506
.~ Heavy metal, aluminum, silicon or phosphorus containing

Current as of: June, 1999
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530 /   HD   CHEMISTRY: NATURAL RESINS OR DERIVATIVES; PEPTIDES OR PROTEINS; LIGNINS OR REACTION PRODUCTS THEREOF

500  DF  LIGNINS OR DERIVATIVES {7}
506.~ Heavy metal, aluminum, silicon or phosphorus containing

DEFINITION

Classification: 530/506

(under subclass 500) Compounds which contain heavy metal (i.e., metals with a density greater than 4.0), aluminum, silicon, or phosphorus.