US PATENT SUBCLASS 514 / 85
.~.~.~ Hetero ring is six-membered consisting of two nitrogens and four carbons

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

1  DF  DESIGNATED ORGANIC ACTIVE INGREDIENT CONTAINING (DOAI) {29}
75  DF  .~ Phosphorus containing other than solely as part of an inorganic ion in an addition salt DOAI {22}
79  DF  .~.~ Nitrogen containing hetero ring {6}
85.~.~.~ Hetero ring is six-membered consisting of two nitrogens and four carbons {1}
86  DF  .~.~.~.~> Nitrogen atoms occupy 1 and 3- positions {2}

DEFINITION

Classification: 514/85

Hetero ring is six-membered consisting of two nitrogens and four carbons:

(under subclass 79) Subject matter in which the organo-phosphorus compound contains a six-membered heterocyclic ring which consists of two nitrogens and four carbons.