US PATENT SUBCLASS 540 / 596
.~.~.~ Additional hetero ring attached directly or indirectly to the hetero ring by nonionic bonding

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.~.~.~ Additional hetero ring attached directly or indirectly to the hetero ring by nonionic bonding {2}
597  DF  .~.~.~.~> The additional hetero ring is six-membered and contains nitrogen {1}
602  DF  .~.~.~.~> The additional hetero ring is five-membered and contains nitrogen {1}

DEFINITION

Classification: 540/596

(under subclass 484) Compounds wherein an additional hetero ring is attached directly or indirectly to the hetero ring by nonionic bonding.

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