US PATENT SUBCLASS 514 / 247
.~.~ Hetero ring is six-membered consisting of two nitrogens and four carbon atoms (e.g., pyridazines, etc.)

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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.~.~ Hetero ring is six-membered consisting of two nitrogens and four carbon atoms (e.g., pyridazines, etc.) {4}
248  DF  .~.~.~> Polycyclo ring system having a 1,2- or 1,4-diazine as one of the cyclos {1}
252  DF  .~.~.~> 1,2- or 1,4-diazine compound having two or more hetero rings {1}
255  DF  .~.~.~> 1,4-diazines
256  DF  .~.~.~> 1,3-diazines (e.g., pyrimidines, etc.) {4}

DEFINITION

Classification: 514/247

Hetero ring is six-membered consisting of two nitrogens and four carbon atoms (e.g., pyridazines, etc.):

(under subclass 183) Subject matter wherein the active ingredient has a six-membered heterocyclic nucleus which consists of two nitrogen and four carbon atoms, e.g., [figure] [caption], etc.