US PATENT SUBCLASS 548 / 444
.~.~.~.~.~.~.~ Chalcogen or nitrogen attached indirectly to the tricyclo ring system by acyclic nonionic bonding

Current as of: June, 1999
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548 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {4}
400  DF  .~.~ Hetero ring is five-membered consisting of one nitrogen and four carbons (e.g., halopyrrolidines, etc.) {20}
416  DF  .~.~.~ Polycyclo ring system having the five-membered hetero ring as one of the cyclos {5}
427  DF  .~.~.~.~ Tricyclo ring system having the five-membered hetero ring as one of the cyclos {6}
439  DF  .~.~.~.~.~ The five-membered hetero ring shares ring carbons with two carbocyclic rings (e.g., tetrahydrocarbazoles, etc.) {3}
440  DF  .~.~.~.~.~.~ The five-membered hetero ring shares ring carbons with two benzene rings (i.e., carbazoles) {5}
444.~.~.~.~.~.~.~ Chalcogen or nitrogen attached indirectly to the tricyclo ring system by acyclic nonionic bonding

DEFINITION

Classification: 548/444

(under subclass 440) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) or nitrogen is attached indirectly to the tricyclo ring system by acyclic nonionic bonding.

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