US PATENT SUBCLASS 549 / 378
.~.~.~.~.~.~ Chalcogen attached directly or 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}
356  DF  .~.~.~ The hetero ring is six-membered {9}
357  DF  .~.~.~.~ Plural ring oxygens in the hetero ring (e.g., 1,2-dioxin, etc.) {4}
377  DF  .~.~.~.~.~ The ring oxygens are in the 1,4-positions of the hetero ring (e.g., 1,4 dioxane, etc.) {2}
378.~.~.~.~.~.~ Chalcogen attached directly or indirectly to the hetero ring by nonionic bonding {1}
379  DF  .~.~.~.~.~.~.~> Plural chalcogens bonded directly to the hetero ring

DEFINITION

Classification: 549/378

(under subclass 377) Compounds in which chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached directly or indirectly to the hetero ring by nonionic bonding.

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