US PATENT SUBCLASS 540 / 62
.~.~.~.~.~.~ Two of the cyclos share at least three ring members or a ring carbon 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}
2  DF  .~.~ Cyclopentanohydrophenanthrene ring system containing {10}
47  DF  .~.~.~ The cyclopentanohydrophenanthrene ring system is part of a polycyclo ring system having at least five cyclos {1}
48  DF  .~.~.~.~ Hetero ring is one of the cyclos of the polycyclo ring system {8}
61  DF  .~.~.~.~.~ The hetero ring contains plural oxygens {2}
62.~.~.~.~.~.~ Two of the cyclos share at least three ring members or a ring carbon is shared by three of the cyclos (e.g., bridged, peri-fused, etc.)

DEFINITION

Classification: 540/62

(under subclass 61) Compounds wherein (a) at least three ring members of one cyclo are ring members of an additional cyclo or (b) a ring carbon is a member of three of the cyclos in the polycyclo ring system (e.g., bridged or peri-fused, etc.).

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