US PATENT SUBCLASS 549 / 460
.~.~.~.~.~.~ Dibenzofurans (including hydrogenated)

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}
456  DF  .~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {3}
458  DF  .~.~.~.~.~ Tricyclo ring system having the hetero ring as one of the cyclos {2}
460.~.~.~.~.~.~ Dibenzofurans (including hydrogenated) {1}
461  DF  .~.~.~.~.~.~.~> Having -C(=X)-, wherein X is chalcogen, attached directly or indirectly to the tricyclo ring system by nonionic bonding

DEFINITION

Classification: 549/460

(under subclass 458) Compounds wherein the hetero ring shares ring members with two six-membered carbocyclic rings, which may contain double bonds between ring members.

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