US PATENT SUBCLASS 540 / 560
.~.~.~.~.~.~.~ Chalcogen in the tricyclo ring system

Current as of: June, 1999
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540 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
484  DF  .~.~ The hetero ring contains seven members including nitrogen and carbon {14}
553  DF  .~.~.~ The hetero ring contains plural nitrogens (e.g., 1,3-diazepines, etc.) {3}
555  DF  .~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos {3}
557  DF  .~.~.~.~.~ Tricyclo ring system which contains the hetero ring as one of the cyclos {1}
558  DF  .~.~.~.~.~.~ Nitrogen of the hetero ring is shared by an additional cyclo of the tricyclo ring system {5}
560.~.~.~.~.~.~.~ Chalcogen in the tricyclo ring system

DEFINITION

Classification: 540/560

(under subclass 558) Compounds wherein one of the remaining cyclos of the tricyclo ring system contains chalcogen (i.e., oxygen, sulfur, selenium or tellurium).

(1) Note. An example of a compound provided for herein is: [figure]