US PATENT SUBCLASS 548 / 950
.~.~ The hetero ring contains four members including nitrogen and carbon

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.~.~ The hetero ring contains four members including nitrogen and carbon {3}
951  DF  .~.~.~> Plural hetero atoms in the hetero ring
952  DF  .~.~.~> Chalcogen bonded directly to ring carbon of the hetero ring
953  DF  .~.~.~> Nitrogen or -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring

DEFINITION

Classification: 548/950

(under subclass 1) Compounds under Class 540, ... wherein the hetero ring contains four members and has nitrogen and carbon as ring members.