US PATENT SUBCLASS 548 / 251
.~.~.~.~ Chalcogen or nitrogen attached directly to the tetrazole 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}
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}
250  DF  .~.~.~ Tetrazoles (including hydrogenated) {3}
251.~.~.~.~ Chalcogen or nitrogen attached directly to the tetrazole ring by nonionic bonding

DEFINITION

Classification: 548/251

(under subclass 250) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) or nitrogen is attached directly to the tetrazole ring by nonionic bonding.

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