US PATENT SUBCLASS 548 / 433
.~.~.~.~.~.~ The tricyclo ring system consists of a benzene ring which shares ring carbons with two nitrogen containing hetero rings (e.g., pyromellitic diimide, etc.)

Current as of: June, 1999
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548 /   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) {4}
400  DF  .~.~ Hetero ring is five-membered consisting of one nitrogen and four carbons (e.g., halopyrrolidines, etc.) {20}
416  DF  .~.~.~ Polycyclo ring system having the five-membered hetero ring as one of the cyclos {5}
427  DF  .~.~.~.~ Tricyclo ring system having the five-membered hetero ring as one of the cyclos {6}
429  DF  .~.~.~.~.~ Plural ring hetero atoms in the tricyclo ring system {2}
433.~.~.~.~.~.~ The tricyclo ring system consists of a benzene ring which shares ring carbons with two nitrogen containing hetero rings (e.g., pyromellitic diimide, etc.)

DEFINITION

Classification: 548/433

(under subclass 429) Compounds wherein the tricyclo ring system consists of a benzene ring which shares ring carbons with two nitrogen containing hetero rings.

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