US PATENT SUBCLASS 514 / 281
.~.~.~.~.~ Two of the cyclos share at least three ring members (i.e., bridged)

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}
279  DF  .~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {4}
280  DF  .~.~.~.~ Pentacyclo ring system having the six-membered hetero ring as one of the cyclos {2}
281.~.~.~.~.~ Two of the cyclos share at least three ring members (i.e., bridged) {1}
282  DF  .~.~.~.~.~.~> One of the five cyclos is five-membered and includes ring chalcogen (e.g., codeine, morphine, etc.)

DEFINITION

Classification: 514/281

Two of the cyclos share at least three ring members, (i.e., bridged):

(under subclass 280) Subject matter wherein two cyclos of the polycyclo ring system share at least three ring members.