US PATENT SUBCLASS 514 / 248
.~.~.~ Polycyclo ring system having a 1,2- or 1,4-diazine as one of the cyclos

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514 /   HD   DRUG, BIO-AFFECTING AND BODY TREATING COMPOSITIONS

1  DF  DESIGNATED ORGANIC ACTIVE INGREDIENT CONTAINING (DOAI) {29}
183  DF  .~ Heterocyclic carbon compounds containing a hetero ring having chalcogen (i.e., O,S,Se or Te) or nitrogen as the only ring hetero atoms DOAI {16}
247  DF  .~.~ Hetero ring is six-membered consisting of two nitrogens and four carbon atoms (e.g., pyridazines, etc.) {4}
248.~.~.~ Polycyclo ring system having a 1,2- or 1,4-diazine as one of the cyclos {1}
249  DF  .~.~.~.~> 1,4-diazine as one of the cyclos {1}

DEFINITION

Classification: 514/248

Polycyclo ring system having a 1,2-or 1,4-diazine as one of the cyclos:

(under subclass 247) Subject matter wherein the six-membered heterocyclic ring is a part of a fused ring or bridged ring system wherein the two nitrogens occupy the 1,2, or 1,4-positions of the diazine ring, e.g., [figure] [caption], etc.