US PATENT SUBCLASS 514 / 462
.~.~.~.~ Spiro 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}
449  DF  .~.~ Oxygen containing hetero ring {4}
461  DF  .~.~.~ The hetero ring is five-membered {5}
462.~.~.~.~ Spiro ring system

DEFINITION

Classification: 514/462

Spiro ring system:

(under subclass 461) Subject matter which contains a spiro ring system, e.g., [figure] [figure]

(1) Note. See section II, Glossary, for the definition of "spiro ring system."