US PATENT SUBCLASS 540 / 469
.~.~.~.~.~ Plural nitrogens in the hetero ring

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}
450  DF  .~.~ The hetero ring contains at least eight members including nitrogen and carbon {9}
467  DF  .~.~.~ The hetero ring contains chalcogen {1}
468  DF  .~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos {1}
469.~.~.~.~.~ Plural nitrogens in the hetero ring

DEFINITION

Classification: 540/469

(under subclass 468) Compounds in which the hetero ring contains at least two nitrogens.

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