US PATENT SUBCLASS 540 / 479
.~.~.~.~ Tricyclo ring system which contains the hetero ring as one of the cyclos

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}
450  DF  .~.~ The hetero ring contains at least eight members including nitrogen and carbon {9}
476  DF  .~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos {2}
479.~.~.~.~ Tricyclo ring system which contains the hetero ring as one of the cyclos

DEFINITION

Classification: 540/479

(under subclass 476) Compounds in which the polycyclo ring system consists of exactly three rings.

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