US PATENT SUBCLASS 548 / 965
.~.~.~ Chalcogen, nitrogen or halogen attached directly to the hetero ring by 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}
954  DF  .~.~ Hetero ring is three-membered including nitrogen and carbon {11}
965.~.~.~ Chalcogen, nitrogen or halogen attached directly to the hetero ring by nonionic bonding

DEFINITION

Classification: 548/965

(under subclass 954) Compounds wherein nitrogen, halogen or chalcogen (i.e., oxygen, sulfur, selenium odr tellurium) is attached directly to the hetero ring by nonionic bonding.

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