US PATENT SUBCLASS 549 / 25
.~.~.~.~.~.~ Chalcogen attached directly to the hetero ring by nonionic bonding

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}
1  DF  .~.~ Sulfur containing hetero ring (e.g., thiiranes, etc.) {9}
13  DF  .~.~.~ The hetero ring is six-membered {3}
23  DF  .~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {2}
24  DF  .~.~.~.~.~ The polycyclo ring system has at least four cyclos {1}
25.~.~.~.~.~.~ Chalcogen attached directly to the hetero ring by nonionic bonding

DEFINITION

Classification: 549/25

(under subclass 24) Compounds in which chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached directly to the hetero ring by nonionic bonding.

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