US PATENT SUBCLASS 548 / 951
.~.~.~ Plural hetero atoms in the hetero ring

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}
950  DF  .~.~ The hetero ring contains four members including nitrogen and carbon {3}
951.~.~.~ Plural hetero atoms in the hetero ring

DEFINITION

Classification: 548/951

(under subclass 950) Compounds in which the hetero ring contains at least two hetero atoms

(1) Note. An example of a compound provided for herein is: [figure]