US PATENT SUBCLASS 548 / 955
.~.~.~ Heavy metal, boron or silicon containing

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {4}
954  DF  .~.~ Hetero ring is three-membered including nitrogen and carbon {11}
955.~.~.~ Heavy metal, boron or silicon containing

DEFINITION

Classification: 548/955

(under subclass 954) Compounds which contain boron, silicon or a metal having a specific gravity greater then four.

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

(2) Note. Examples of compounds provided for herein are: [figure] [figure]