US PATENT SUBCLASS 548 / 141
.~.~.~.~.~.~ Chalcogen or additional nitrogen attached directly to ring carbon of the thiadiazole ring 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}
141.~.~.~.~.~.~ Chalcogen or additional nitrogen attached directly to ring carbon of the thiadiazole ring by nonionic bonding

DEFINITION

Classification: 548/141

(under subclass 138) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) or additional nitrogen is attached directly to ring carbon of the thiadiazole ring by nonionic bonding.

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

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