US PATENT SUBCLASS 549 / 208
.~.~.~.~ The hetero ring has three members or at least seven members

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}
206  DF  .~.~.~ Heavy metal or aluminum containing {5}
208.~.~.~.~ The hetero ring has three members or at least seven members

DEFINITION

Classification: 549/208

(under subclass 206) Compounds wherein the hetero ring contains either (1) three members, or (2) seven or more members.

(1) Note. Examples of compounds provided for herein are: [figure] [figure]