US PATENT SUBCLASS 549 / 90
.~.~.~ The hetero ring is three-membered and has chalcogen or nitrogen attached directly or indirectly thereto 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}
1  DF  .~.~ Sulfur containing hetero ring (e.g., thiiranes, etc.) {9}
90.~.~.~ The hetero ring is three-membered and has chalcogen or nitrogen attached directly or indirectly thereto by nonionic bonding

DEFINITION

Classification: 549/90

(under subclass 1) Compounds wherein the hetero ring is three-membered and contains chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) or nitrogen attached directly or indirectly thereto by nonionic bonding.

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