US PATENT SUBCLASS 549 / 397
.~.~.~.~.~.~ The two cyclos share at least three ring members (i.e., bridged)

Current as of: June, 1999
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549 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {2}
200  DF  .~.~ Oxygen containing hetero ring (e.g., dioxirane, etc.) {16}
356  DF  .~.~.~ The hetero ring is six-membered {9}
381  DF  .~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {4}
396  DF  .~.~.~.~.~ Bicyclo ring system having the hetero ring as one of the cyclos {2}
397.~.~.~.~.~.~ The two cyclos share at least three ring members (i.e., bridged)

DEFINITION

Classification: 549/397

(under subclass 396) Compounds wherein at least three ring members of one cyclo are ring members of the other cyclo in the bicyclo ring system (i.e., bridged).

(1) Note. An example of a compound provided for herein is: [figure]