US PATENT SUBCLASS 548 / 250
.~.~.~ Tetrazoles (including hydrogenated)

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.~.~.~ Tetrazoles (including hydrogenated) {3}
251  DF  .~.~.~.~> Chalcogen or nitrogen attached directly to the tetrazole ring by nonionic bonding
252  DF  .~.~.~.~> Chalcogen attached indirectly to the tetrazole ring by nonionic bonding {1}
254  DF  .~.~.~.~> Nitrogen attached indirectly to the tetrazole ring by nonionic bonding

DEFINITION

Classification: 548/250

(under subclass 100) Compounds in which the five-membered hetero ring consists of four ring nitrogens and one ring carbon.

(1) Note. This subclass provides for compounds containing the following ring which may have double bonds between its members: [figure]