US PATENT SUBCLASS 549 / 496
.~.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, attached indirectly to the hetero ring by nonionic bonding


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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}
496.~.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, attached indirectly to the hetero ring by nonionic bonding


DEFINITION

Classification: 549/496

(under subclass 491) Compounds wherein a -- group, wherein X is chalcogen (i.e., oxygen, sulfur, selenium or tellurium), is attached indirectly to the hetero ring by nonionic bonding.

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