US PATENT SUBCLASS 540 / 591
.~.~.~.~.~.~.~ Chalcogen attached directly or indirectly to the hetero ring by acyclic nonionic bonding

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}
576  DF  .~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos {4}
586  DF  .~.~.~.~ Tricyclo ring system which contains the hetero ring as one of the cyclos {1}
587  DF  .~.~.~.~.~ The hetero ring shares ring members with each of two benzene rings in the tricyclo ring system (e.g., morphanthridines, etc.) {1}
588  DF  .~.~.~.~.~.~ The nitrogen of the hetero ring is bonded directly to each of the two benzene rings (e.g., iminodibenzyl, etc.) {4}
591.~.~.~.~.~.~.~ Chalcogen attached directly or indirectly to the hetero ring by acyclic nonionic bonding

DEFINITION

Classification: 540/591

(under subclass 588) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium or tellurium) is attached directly or indirectly to the hetero ring by acyclic nonionic bonding.

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