US PATENT SUBCLASS 549 / 230
.~.~.~.~.~ The five-membered hetero ring, except for the =X to the ring, is unsubstituted or hydrocarbyl substituted only

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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}
228  DF  .~.~.~ The hetero ring contains -O-C(=X)-O- as part of its structure, wherein X is chalcogen (e.g., cyclic carbonates, etc.) {1}
229  DF  .~.~.~.~ The hetero ring is five-membered {1}
230.~.~.~.~.~ The five-membered hetero ring, except for the =X to the ring, is unsubstituted or hydrocarbyl substituted only

DEFINITION

Classification: 549/230

(under subclass 229) Compounds in which the five-membered hetero ring, except for the single =X to the ring, has only hydrogen or hydrocarbyl group(s) bonded to it.

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