US PATENT SUBCLASS 552 / 4
.~.~ Silicon, boron, aluminum or heavy metal containing

Current as of: June, 1999
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552 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
1  DF  .~ Azides {8}
4.~.~ Silicon, boron, aluminum or heavy metal containing

DEFINITION

Classification: 552/4

(under subclass 1) Compounds which contain silicon, boron, aluminum or heavy metal.

(1) Note. Heavy metals are those whose specific gravity is greater than 4.00.

(2) Note. Arsenic is considered as a metal.