US PATENT SUBCLASS 514 / 334
.~.~.~.~ The six-membered hetero rings are bonded directly to each other

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}
277  DF  .~.~ Hetero ring is six-membered consisting of one nitrogen and five carbon atoms {11}
332  DF  .~.~.~ Plural six-membered hetero rings consisting of one nitrogen and five carbon atoms {3}
334.~.~.~.~ The six-membered hetero rings are bonded directly to each other

DEFINITION

Classification: 514/334

The six-membered rings are bonded directly to each other:

(under subclass 332) Subject matter wherein pyridine or partially hydrogenated pyridine rings are bonded directly to each other.