US PATENT SUBCLASS 549 / 493
.~.~.~.~.~.~ The nitrogen is bonded directly to a -C(=X)- group, wherein X is chalcogen

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}
491  DF  .~.~.~.~ Nitrogen attached indirectly to the hetero ring by nonionic bonding {2}
492  DF  .~.~.~.~.~ Nitrogen and the hetero ring are single bonded directly to the same acyclic saturated hydrocarbon group {3}
493.~.~.~.~.~.~ The nitrogen is bonded directly to a -C(=X)- group, wherein X is chalcogen

DEFINITION

Classification: 549/493

(under subclass 492) Compounds wherein the nitrogen is bonded directly to a -- group, in which X is chalcogen (i.e., oxygen, sulfur, selenium or tellurium).

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