US PATENT SUBCLASS 549 / 502
.~.~.~.~.~ Plural chalcogens 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}
497  DF  .~.~.~.~ Chalcogen attached indirectly to the hetero ring by nonionic bonding {3}
502.~.~.~.~.~ Plural chalcogens attached indirectly to the hetero ring by nonionic bonding

DEFINITION

Classification: 549/502

(under subclass 497) Compounds wherein at least two chalcogens (i.e., oxygen, sulfur, selenium, or tellurium) are attached indirectly to the hetero ring by nonionic bonding.

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