US PATENT SUBCLASS 549 / 28
.~.~.~.~ Chalcogen or nitrogen attached directly to the hetero ring by nonionic bonding

Current as of: June, 1999
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549 /   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) {2}
1  DF  .~.~ Sulfur containing hetero ring (e.g., thiiranes, etc.) {9}
13  DF  .~.~.~ The hetero ring is six-membered {3}
28.~.~.~.~ Chalcogen or nitrogen attached directly to the hetero ring by nonionic bonding

DEFINITION

Classification: 549/28

(under subclass 13) Compounds in which chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) or nitrogen is attached directly to the hetero ring by nonionic bonding.