US PATENT SUBCLASS 540 / 452
.~.~.~.~ Heavy metal, aluminum, boron or silicon containing

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
450  DF  .~.~ The hetero ring contains at least eight members including nitrogen and carbon {9}
451  DF  .~.~.~ Chalcogen double bonded directly to a ring carbon of the hetero ring which is adjacent to the ring nitrogen (e.g., laurolactam, etc.) {7}
452.~.~.~.~ Heavy metal, aluminum, boron or silicon containing

DEFINITION

Classification: 540/452

(under subclass 451) Compounds which include a metal having a specific gravity greater than four, aluminum, boron or silicon.

(1) Note. Arsenic is considered a metal for purposes of this subclass.