US PATENT SUBCLASS 549 / 472
.~.~.~.~ Plural hetero rings


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}
472.~.~.~.~ Plural hetero rings {1}
473  DF  .~.~.~.~.~> Acyclic -C(=X)-, wherein X is chalcogen, attached directly or indirectly to the hetero ring by nonionic bonding


DEFINITION

Classification: 549/472

(under subclass 429) Compounds wherein at least two hetero rings, which may be the same or different, are present.

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