US PATENT SUBCLASS 540 / 597
.~.~.~.~ The additional hetero ring is six-membered and contains nitrogen


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}
484  DF  .~.~ The hetero ring contains seven members including nitrogen and carbon {14}
596  DF  .~.~.~ Additional hetero ring attached directly or indirectly to the hetero ring by nonionic bonding {2}
597.~.~.~.~ The additional hetero ring is six-membered and contains nitrogen {1}
598  DF  .~.~.~.~.~> Plural hetero atoms in the additional hetero ring {2}


DEFINITION

Classification: 540/597

(under subclass 596) Compounds wherein the additional hetero ring is six-membered and contains nitrogen.

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