US PATENT SUBCLASS 540 / 467
.~.~.~ The hetero ring contains chalcogen

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}
467.~.~.~ The hetero ring contains chalcogen {1}
468  DF  .~.~.~.~> Polycyclo ring system which contains the hetero ring as one of the cyclos {1}

DEFINITION

Classification: 540/467

(under subclass 450) Compounds in which the hetero ring contains chalcogen (i.e., oxygen, sulfur, selenium or tellurium).

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