US PATENT SUBCLASS 548 / 953
.~.~.~ Nitrogen or -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring

Current as of: June, 1999
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548 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {4}
950  DF  .~.~ The hetero ring contains four members including nitrogen and carbon {3}
953.~.~.~ Nitrogen or -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring

DEFINITION

Classification: 548/953

(under subclass 950) Compounds in which nitrogen or, wherein X is chalcogen (i.e., oxygen, sulfur, selenium or tellurium) is bonded directly to the hetero ring.

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