US PATENT SUBCLASS 548 / 139
.~.~.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, attached directly to the nitrogen by nonionic bonding

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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}
100  DF  .~.~ Hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazoles, etc.) {18}
125  DF  .~.~.~ The five-membered hetero ring consists of chalcogen, plural nitrogens, and carbon {7}
136  DF  .~.~.~.~ 1,3,4-thiadiazoles (including hydrogenated) {3}
138  DF  .~.~.~.~.~ Nitrogen attached directly to the thiadiazole ring by nonionic bonding {2}
139.~.~.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, attached directly to the nitrogen by nonionic bonding {1}
140  DF  .~.~.~.~.~.~.~> Additional nitrogen attached directly to the -C(=X)- group by nonionic bonding

DEFINITION

Classification: 548/139

(under subclass 138) Compounds in which a group, wherein X is chalcogen (i.e., oxygen, sulfur, selenium, or tellurium), is attached directly to the nitrogen by nonionic bonding.

(1) Note. An example of a compound provided for herein is: [figure]