US PATENT SUBCLASS 549 / 453
.~.~.~.~.~ Chalcogen attached indirectly to the hetero ring by nonionic bonding

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}
453.~.~.~.~.~ Chalcogen attached indirectly to the hetero ring by nonionic bonding {1}
454  DF  .~.~.~.~.~.~> The chalcogen, X, is in a -C(=X)- group

DEFINITION

Classification: 549/453

(under subclass 430) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached indirectly to the hetero ring by nonionic bonding.

(1) Note. An example of a compound provided for herein is: [figure]