US PATENT SUBCLASS 549 / 72
.~.~.~.~.~ Nitrogen or chalcogen attached indirectly 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}
29  DF  .~.~.~ The hetero ring is five-membered {13}
70  DF  .~.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring {3}
72.~.~.~.~.~ Nitrogen or chalcogen attached indirectly to the hetero ring by nonionic bonding

DEFINITION

Classification: 549/72

(under subclass 70) Compounds wherein nitrogen or chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached indirectly to the hetero ring by nonionic bonding.

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