US PATENT SUBCLASS 540 / 482
.~.~.~ Chalcogen or nitrogen attached directly 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}
450  DF  .~.~ The hetero ring contains at least eight members including nitrogen and carbon {9}
482.~.~.~ Chalcogen or nitrogen attached directly to the hetero ring by nonionic bonding

DEFINITION

Classification: 540/482

(under subclass 450) Compounds in which nitrogen or chalcogen (i.e., oxygen, sulfur, selenium or tellurium) is attached directly to the hetero ring by nonionic bonding.

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