US PATENT SUBCLASS 514 / 250
.~.~.~.~.~ At least three rings in the polycyclo ring system

Current as of: June, 1999
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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  DF  .~.~.~ 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}
250.~.~.~.~.~ At least three rings in the polycyclo ring system {1}
251  DF  .~.~.~.~.~.~> Isoalloxazine (e.g., riboflavins, Vitamin B2, etc.)

DEFINITION

Classification: 514/250

At least three rings in the polycyclo ring system:

(under subclass 249) Subject matter wherein the active ingredient is a tricyclo and has the 1,4-diazine nucleus as one of the cyclos, e.g., [figure] [caption], etc.