US PATENT SUBCLASS 549 / 510
.~.~.~ The hetero ring is four-membered

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}
510.~.~.~ The hetero ring is four-membered {1}
511  DF  .~.~.~.~> Sulfur or halogen attached directly or indirectly to the hetero ring by nonionic bonding

DEFINITION

Classification: 549/510

(under subclass 200) Compounds in which the oxygen containing hetero ring has four ring members.

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