US PATENT SUBCLASS 548 / 317.5
.~.~.~.~.~.~ Three chalcogens bonded directly to ring carbons of the diazole ring

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}
300.1  DF  .~.~.~ 1,3-diazoles (including hydrogenated) {9}
316.4  DF  .~.~.~.~ Chalcogen bonded directly to ring carbon of the diazole ring (e.g., N-vinyl-N, N'ethylene urea, etc.) {9}
317.1  DF  .~.~.~.~.~ Plural chalcogens bonded directly to ring carbons of the diazole ring {7}
317.5.~.~.~.~.~.~ Three chalcogens bonded directly to ring carbons of the diazole ring

DEFINITION

Classification: 548/317.5

(under subclass 317.1) Compounds wherein three chalcogens (i.e., oxygen, sulfur, selenium, or tellurium) are bonded directly to ring carbons of the diazole ring.

(1) Note. This subclass contains, for example: [figure]

(2) Note. Included in this subclass are compounds which have been commonly called parabanic acids.