US PATENT SUBCLASS 540 / 483
.~.~.~ Plural nitrogens attached indirectly to the hetero ring by acyclic 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}
450  DF  .~.~ The hetero ring contains at least eight members including nitrogen and carbon {9}
483.~.~.~ Plural nitrogens attached indirectly to the hetero ring by acyclic nonionic bonding


DEFINITION

Classification: 540/483

(under subclass 450) Compounds in which at least two nitrogens are attached indirectly to the hetero ring by acyclic nonionic bonding.

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