US PATENT SUBCLASS 540 / 556
.~.~.~.~.~ Two of the cyclos share at least three ring members or a ring member is shared by three of the cyclos (e.g., bridged, peri-fused, etc.)

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}
556.~.~.~.~.~ Two of the cyclos share at least three ring members or a ring member is shared by three of the cyclos (e.g., bridged, peri-fused, etc.)

DEFINITION

Classification: 540/556

(under subclass 555) Compounds wherein (a) at least three members of one cyclo are members of an additional cyclo in the polycyclo ring system, or (b) one ring member is a member of three of the cyclos in the polycyclo ring system (e.g., bridged, peri-fused, etc.).

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