US PATENT SUBCLASS 549 / 449
.~.~.~.~.~ Nitrogen or chalcogen bonded directly to the hetero ring

Current as of: June, 1999
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549 /   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) {2}
200  DF  .~.~ Oxygen containing hetero ring (e.g., dioxirane, etc.) {16}
429  DF  .~.~.~ The hetero ring is five-membered {14}
430  DF  .~.~.~.~ Plural ring oxygens in the hetero ring {8}
449.~.~.~.~.~ Nitrogen or chalcogen bonded directly to the hetero ring

DEFINITION

Classification: 549/449

(under subclass 430) Compounds wherein nitrogen or 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]